| Dec'19 | Dec'18 | Dec'17 | Dec'16 | Dec'15 | Dec'14 | Dec'13 |
|---|---|---|---|---|---|---|
Cash flows from operating activities: | ||||||
Net loss | ||||||
-41,873 | -32,703 | -26,512 | -17,274 | -11,328 | -7,890 | -2,160 |
Issuance of common stock under subscription agreement | ||||||
- | - | - | 281 | 330 | 300 | - |
Share-based compensation expense | ||||||
3,970 | 3,679 | 2,409 | 198 | 3,015 | 4,298 | - |
Non-cash interest expense | ||||||
340 | 376 | 94 | 158 | - | - | - |
Depreciation and amortization | ||||||
300 | 300 | 300 | 341 | 184 | 144 | 148 |
Amortization of premiums and discounts on available-for-sale securities | ||||||
432 | 416 | 0 | - | - | - | - |
Change in fair value of preferred stock warrants | ||||||
- | - | - | 3 | - | - | - |
Loss on impairment of assets | ||||||
- | - | - | - | 0 | - | - |
Noncash interest on note payable related party | ||||||
- | - | - | - | 132 | 1,007 | 1,937 |
Loss on extinguishment of debt | ||||||
- | - | - | - | 0 | - | - |
Lease termination | ||||||
- | - | - | - | - | -46 | - |
Gain on legal settlement | ||||||
- | - | - | - | - | 100 | 250 |
Changes in operating assets and liabilities: | ||||||
Accounts receivable | ||||||
84 | -1,432 | 1,436 | 20 | -694 | 94 | -202 |
Inventory | ||||||
- | - | - | - | 8 | -178 | 187 |
Prepaid expenses and other assets | ||||||
-126 | -51 | 724 | 426 | -28 | -191 | 65 |
Deferred revenue | ||||||
- | - | - | -519 | - | - | - |
Accounts payable | ||||||
525 | -335 | -101 | 292 | - | - | - |
Accrued and other liabilities | ||||||
1,084 | 791 | -2,205 | 2,211 | - | - | - |
Accounts payable and accrued liabilities | ||||||
- | - | - | - | 633 | 383 | -280 |
Lease termination/abandonment payable | ||||||
- | - | - | - | 248 | 376 | 319 |
Net cash used in operating activities of discontinued operations | ||||||
- | - | - | - | - | - | -194 |
Net cash used in operating activities | ||||||
-36,056 | -26,844 | -28,167 | -14,755 | -6,898 | -2,213 | -1,168 |
Cash flows from investing activities: | ||||||
Purchases of short-term investments | ||||||
32,690 | 62,462 | 0 | 1,000 | - | - | - |
Maturities of short-term investments | ||||||
61,000 | 33,000 | 0 | 1,000 | - | - | - |
Cash acquired in reverse merger | ||||||
- | - | 1,280 | 0 | - | - | - |
Proceeds from sale of property and equipment | ||||||
- | - | 0 | - | - | - | - |
Purchases of property and equipment | ||||||
84 | 445 | 246 | 250 | 123 | 266 | 5 |
Decrease in security deposit on lease | ||||||
- | - | - | - | 28 | -8 | 11 |
Net cash provided by (used in) investing activities | ||||||
28,226 | -29,907 | 1,034 | -250 | -95 | -274 | 6 |
Cash flows from financing activities: | ||||||
Proceeds from the sale of common stock and warrants | ||||||
2,283 | 44,529 | - | - | 13,095 | 6,644 | -500 |
Payment of issuance costs associated with the sale of common stock | ||||||
77 | 3,037 | - | - | - | - | - |
Proceeds from issuance of notes payable | ||||||
- | - | 10,000 | 0 | - | - | - |
Proceeds from issuance of redeemable convertible preferred stock | ||||||
- | - | - | 16,091 | - | - | - |
Repayment of note payable related party | ||||||
- | - | - | - | - | - | 10,461 |
Payments of principal on note payable | ||||||
2,333 | 0 | 4,667 | 333 | - | - | 61 |
Proceeds from stock purchases under employee stock purchase plan | ||||||
110 | 242 | 110 | 0 | - | - | - |
Proceeds from Stock Options Exercised | ||||||
100 | 200 | 300 | 213 | - | - | - |
Payment of notes payable issuance costs | ||||||
- | - | - | 6 | - | - | - |
Proceeds from issuance of note payable/amounts due to related party | ||||||
- | - | - | - | - | 795 | 12,566 |
Proceeds from cash released from restricted cash account securing a letter of credit | ||||||
- | - | - | - | 50 | - | - |
Shares repurchased to satisfy tax withholding obligation for restricted stock awards | ||||||
- | - | - | - | 363 | - | - |
Repayment of capital lease obligation | ||||||
- | - | - | - | 76 | 42 | - |
Fractional shares repurchased upon reverse stock split | ||||||
- | - | - | - | 0 | - | - |
Distributions to member | ||||||
- | - | - | - | - | - | 285 |
Net cash provided by financing activities | ||||||
70 | 41,916 | 52,470 | 15,874 | 12,706 | 7,397 | 1,259 |
Net increase (decrease) in cash and cash equivalents | ||||||
-7,760 | -14,835 | - | - | - | - | - |
Net increase (decrease) in cash and cash equivalents | ||||||
- | - | - | 869 | 5,713 | 4,910 | 97 |
Net decrease in cash and cash equivalents | ||||||
- | - | 25,337 | - | - | - | - |
Supplemental disclosure of cash flow information | ||||||
Cash paid for interest | ||||||
511 | 489 | 446 | - | - | - | - |
Cash paid for interest | ||||||
- | - | - | 164 | 6 | 1 | 1,209 |
Supplemental disclosure of non-cash investing and financing activities | ||||||
Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, before Tax | ||||||
3 | -3 | 0 | - | - | - | - |
Amortization of public offering costs | ||||||
3 | 55 | 0 | - | - | - | - |
Unrealized Gain (Loss) on Investments | ||||||
3 | -3 | - | - | - | - | - |
Conversion of preferred stock to common stock | ||||||
- | - | 76,981 | 0 | - | - | - |
Liabilities assumed, net of non-cash assets received in reverse merger | ||||||
- | - | 1,076 | 0 | - | - | - |
Issuance of warrant classified as equity | ||||||
- | - | 127 | 0 | - | - | - |
Reclassification of preferred stock warrant (accrued liability) to common stock warrant (equity) | ||||||
- | - | 51 | 0 | - | - | - |
Accretion of redeemable convertible preferred stock to redemption value | ||||||
- | - | 5 | 49 | - | - | - |
Asset acquired under capital lease | ||||||
- | - | - | - | - | 164 | - |
Private Financing | ||||||
Proceeds from the sale of common stock | ||||||
- | - | 40,703 | - | - | - | - |
Payments of Stock Issuance Costs | ||||||
- | - | 1,216 | - | - | - | - |
Transfer of common stock issuance costs from prepaid expenses and other current assets to equity | ||||||
- | - | 331 | - | - | - | - |
At-the-market | ||||||
Proceeds from the sale of common stock | ||||||
- | - | 7,862 | - | - | - | - |
Payment of issuance costs associated with the sale of common stock | ||||||
- | - | 330 | - | - | - | - |
Public offering | ||||||
Proceeds from the sale of common stock | ||||||
- | - | 0 | - | - | - | - |
Payment of issuance costs associated with the sale of common stock | ||||||
- | - | 0 | - | - | - | - |
Shelf Registration | ||||||
Payments of Stock Issuance Costs | ||||||
- | - | 299 | - | - | - | - |
At-the-market Offering [Member] | ||||||
Transfer of common stock issuance costs from prepaid expenses and other current assets to equity | ||||||
- | - | 23 | - | - | - | - |