| Mar'20 | Dec'19 | Sep'19 | Jun'19 | Mar'19 | Dec'18 | Sep'18 | Jun'18 | Mar'18 | Dec'17 | Sep'17 | Jun'17 | Mar'17 | Dec'16 | Sep'16 | Jun'16 | Mar'16 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Cash flows from operating activities: | ||||||||||||||||
Net income (loss) | ||||||||||||||||
-613 | 926 | 2,137 | 2,710 | -1,141 | -2,584 | 0 | 0 | 0 | - | - | - | - | - | - | - | - |
Net income (loss) | ||||||||||||||||
- | - | - | - | - | - | - | - | - | - | - | - | 3,979 | - | 0 | 0 | 0 |
Adjustments to reconcile net income (loss) to net cash used in operating activities: | ||||||||||||||||
Depreciation | ||||||||||||||||
438 | 493 | 537 | 589 | 642 | 587 | 522 | 479 | 441 | 436 | 474 | 481 | 493 | 495 | 0 | 0 | 0 |
Amortization | ||||||||||||||||
655 | 655 | 660 | 667 | 671 | 677 | 692 | 597 | 653 | 581 | 493 | 512 | 379 | 373 | 0 | 0 | 0 |
Fair market value adjustment - warrants | ||||||||||||||||
- | - | - | - | - | - | - | - | - | - | - | - | - | -460 | 0 | 0 | 0 |
Amortization of premium (discounts) on investments, net | ||||||||||||||||
223 | 312 | 356 | 334 | 275 | 202 | 0 | 0 | 0 | - | - | - | - | - | - | - | - |
Stock-based compensation | ||||||||||||||||
2,358 | 2,204 | 1,979 | 1,838 | 3,065 | 2,910 | 2,808 | 2,614 | 1,021 | 736 | 538 | 436 | 343 | 298 | 0 | 0 | 0 |
Deferred tax liability | ||||||||||||||||
- | - | - | 3 | 32 | 30 | -43 | -0 | -5 | 2 | 0 | 0 | 0 | - | - | - | - |
Changes in operating assets and liabilities: | ||||||||||||||||
Trade accounts receivable | ||||||||||||||||
-964 | 643 | 1,175 | 2,867 | 162 | -1,043 | 42 | -880 | 82 | 2,679 | 1,358 | 2,893 | 3,833 | 1,422 | 0 | 0 | 0 |
Inventory | ||||||||||||||||
-287 | -158 | 48 | 302 | 764 | 610 | 607 | 184 | -22 | 162 | 72 | 99 | 61 | 27 | 0 | 0 | 0 |
Prepaid expenses and other assets | ||||||||||||||||
28 | 189 | 485 | 265 | -346 | 241 | 280 | 379 | 961 | 526 | 407 | 190 | 279 | 120 | 0 | 0 | 0 |
Accounts payable | ||||||||||||||||
-1,098 | -303 | 563 | 1,393 | 551 | 294 | 57 | -52 | 101 | -102 | -357 | 330 | 1,467 | 1,075 | 0 | 0 | 0 |
Accrued bonus | ||||||||||||||||
-53 | -691 | -412 | -26 | 309 | 416 | 713 | 299 | 119 | 476 | 523 | 402 | 201 | 413 | 0 | 0 | 0 |
Accrued liabilities | ||||||||||||||||
-173 | 234 | 200 | -115 | -448 | -470 | -392 | -202 | 277 | 50 | 292 | 446 | 190 | 411 | 0 | 0 | 0 |
Deferred obligation under operating lease | ||||||||||||||||
-200 | -196 | -154 | -150 | -148 | -123 | -112 | -107 | -101 | -117 | -118 | -114 | -110 | -106 | 0 | 0 | 0 |
Net cash used in operating activities | ||||||||||||||||
2,323 | 2,350 | 3,493 | 3,180 | 2,328 | 1,377 | 0 | 0 | 0 | - | - | - | - | - | - | - | - |
Cash flows from investing activities: | ||||||||||||||||
Purchases of available-for-sale securities | ||||||||||||||||
0 | - | - | - | 0 | - | - | - | - | - | - | - | - | - | - | - | - |
Net cash used in operating activities | ||||||||||||||||
- | - | - | - | - | - | - | - | - | - | - | - | 2,403 | - | 0 | 0 | 0 |
Purchases of available-for-sale securities | ||||||||||||||||
- | - | - | - | - | - | 0 | 0 | 0 | - | - | - | - | - | - | - | - |
Maturities of available-for-sale securities | ||||||||||||||||
37,085 | 35,270 | 33,556 | 36,682 | 33,077 | 30,992 | 0 | 0 | 0 | - | - | - | - | - | - | - | - |
Purchases of property and equipment | ||||||||||||||||
1,152 | 1,196 | 1,283 | 742 | 645 | 990 | 819 | 746 | 646 | 263 | 195 | 398 | 353 | 275 | 0 | 0 | 0 |
Net cash provided by (used in) investing activities | ||||||||||||||||
9,187 | -2,382 | -3,144 | -2,141 | -3,972 | 336 | 0 | 0 | 0 | - | - | - | - | - | - | - | - |
Cash flows from financing activities: | ||||||||||||||||
Net cash provided by (used in) investing activities | ||||||||||||||||
- | - | - | - | - | - | - | - | - | - | - | - | -353 | - | 0 | 0 | 0 |
Repayment of notes payable | ||||||||||||||||
- | - | - | - | - | 1,333 | 1,333 | 1,334 | 1,333 | 1,389 | 1,463 | 1,536 | 1,609 | 1,624 | 0 | 0 | 0 |
Reversal of costs related to initial public offering | ||||||||||||||||
- | - | - | - | - | - | - | - | - | - | 0 | 0 | 0 | - | - | - | - |
Repurchases of common stock | ||||||||||||||||
1,224 | 1,227 | 1,136 | 1,044 | 1,587 | 2,174 | 0 | 0 | 0 | - | - | - | - | - | - | - | - |
Proceeds from issuance of common stock, net | ||||||||||||||||
0 | - | - | - | 0 | - | - | - | - | - | - | - | - | - | - | - | - |
Proceeds from exercise of stock options | ||||||||||||||||
- | - | - | - | - | - | - | 0 | 368 | - | 0 | 0 | 0 | - | - | - | - |
Net cash provided by (used in) financing activities | ||||||||||||||||
-550 | -392 | -542 | -656 | -2,069 | -3,117 | 0 | 0 | 0 | - | - | - | - | - | - | - | - |
Net increase (decrease) in cash, cash equivalents and restricted cash | ||||||||||||||||
0 | - | - | - | 0 | - | - | - | - | - | - | - | - | - | - | - | - |
Supplemental disclosure of cash flow information: | ||||||||||||||||
Interest paid | ||||||||||||||||
- | - | - | - | 22 | 37 | 0 | 0 | 0 | - | - | - | - | - | - | - | - |
Interest paid | ||||||||||||||||
- | - | - | - | - | - | - | - | - | - | - | - | 157 | - | 0 | 0 | 0 |
Taxes paid | ||||||||||||||||
72 | 71 | 74 | 74 | 59 | 46 | 0 | 0 | 0 | - | - | - | - | - | - | - | - |
Supplemental disclosure of non-cash investing and financing activities: | ||||||||||||||||
Accretion of Series E, F, and G preferred redeemable convertible stock to redemption amount | ||||||||||||||||
- | - | - | - | - | - | - | - | - | - | - | - | - | 1,356 | 0 | 0 | 0 |
Accrual of property and equipment | ||||||||||||||||
0 | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
Net cash used in financing activities | ||||||||||||||||
- | - | - | - | - | - | - | - | - | - | - | - | 35,772 | - | 0 | 0 | 0 |
Net increase (decrease) in cash and cash equivalents | ||||||||||||||||
- | - | - | - | - | - | - | 0 | -26,396 | - | 1,339 | 31,322 | 37,821 | 39,825 | 0 | 0 | 0 |