| 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
Cash flows from operating activities: | ||||||||||||
Net loss | ||||||||||||
-7,585 | -11,359 | -13,288 | -11,273 | -11,419 | -9,611 | -9,510 | -8,647 | -7,880 | - | - | - | - |
Net loss | ||||||||||||
- | - | - | - | - | - | - | - | - | - | - | - | -5,671 |
Adjustments to reconcile net loss to net cash used in operating activities: | ||||||||||||
Stock-based compensation expense | ||||||||||||
1,035 | 778 | 810 | 772 | 629 | 537 | 595 | 513 | 404 | 222 | 99 | 100 | 96 |
Depreciation expense | ||||||||||||
41 | 42 | 42 | 39 | 40 | 34 | 17 | 8 | 19 | 20 | 19 | 17 | 17 |
Non-cash interest expense | ||||||||||||
2 | 2 | 2 | 2 | 2 | 2 | 2 | 82 | 75 | 87 | 101 | 76 | 87 |
Amortization of operating lease assets | ||||||||||||
128 | - | - | - | - | - | - | - | - | - | - | - | - |
Non-cash lease expense | ||||||||||||
6 | - | - | - | 125 | - | - | - | - | - | - | - | - |
Amortization of premium on investments | ||||||||||||
- | - | - | - | - | - | - | - | - | 0 | 0 | 5 | 28 |
Change in fair value of warrant liability | ||||||||||||
- | - | - | - | - | - | - | - | - | 64 | 161 | 35 | -3 |
Changes in assets and liabilities: | ||||||||||||
Prepaid expenses and other current assets | ||||||||||||
-712 | 868 | -1,566 | 2,410 | -1,510 | 648 | 1,267 | -16 | -612 | 962 | 227 | -136 | -69 |
Other assets | ||||||||||||
- | 0 | 0 | -267 | 144 | -68 | 95 | -35 | 42 | - | - | - | - |
Accounts payable | ||||||||||||
-1,309 | -562 | 1,318 | -318 | 534 | 442 | 725 | -1,255 | 529 | 49 | 340 | -94 | -96 |
Accrued expenses | ||||||||||||
-1,498 | - | - | - | -962 | - | - | - | - | - | - | - | - |
Accrued expenses | ||||||||||||
- | - | - | - | - | - | - | 604 | -616 | - | 632 | 60 | -824 |
Operating lease liabilities | ||||||||||||
-90 | -163 | -124 | -119 | -125 | - | - | - | - | - | - | - | - |
Other liabilities | ||||||||||||
- | - | - | - | - | 2 | 11 | 4 | 3 | - | - | - | - |
Net cash used in operating activities | ||||||||||||
-8,558 | -11,925 | -9,071 | -12,826 | -9,810 | -8,710 | -8,210 | -8,023 | -6,896 | - | - | - | - |
Cash flows from investing activities: | ||||||||||||
Net cash used in operating activities | ||||||||||||
- | - | - | - | - | - | - | - | - | - | - | - | -6,297 |
Purchases of property and equipment | ||||||||||||
- | 0 | 21 | 17 | 84 | 162 | 41 | 84 | 31 | 1 | 0 | 5 | 51 |
Maturities of investments | ||||||||||||
- | - | - | - | - | - | - | - | - | 0 | 3,249 | 12,122 | 9,350 |
Net cash (used in) provided by investing activities | ||||||||||||
- | - | - | - | - | - | - | - | - | - | - | - | 9,299 |
Net cash used in investing activities | ||||||||||||
- | 0 | -21 | -17 | -84 | -162 | -41 | -84 | -31 | - | - | - | - |
Proceeds from exercise of stock options | ||||||||||||
10 | 17 | 6 | 0 | 13 | 52 | 6 | 80 | 1 | 23 | 3 | 0 | 2 |
Repayment of loan payable | ||||||||||||
1,000 | - | - | - | - | 0 | 0 | 9,492 | 1,000 | - | - | - | - |
Payments of common stock offering costs | ||||||||||||
- | - | - | - | - | - | - | - | 186 | - | - | - | - |
Other | ||||||||||||
-8 | -7 | -8 | -7 | -7 | - | - | - | - | - | - | - | - |
Net cash (used in) provided by financing activities | ||||||||||||
-998 | 2,513 | -12 | 9,611 | 6 | -44 | -43 | 578 | -1,185 | - | - | - | - |
Net decrease in cash and cash equivalents | ||||||||||||
-9,556 | -9,412 | -9,104 | -3,232 | -9,888 | -8,916 | -8,294 | -7,529 | -8,112 | - | - | - | - |
Supplemental disclosures: | ||||||||||||
Net cash (used in) provided by financing activities | ||||||||||||
- | - | - | - | - | - | - | - | - | - | - | - | 2 |
Net (decrease) increase in cash and cash equivalents | ||||||||||||
- | - | - | - | - | - | - | - | - | - | - | - | 3,004 |
Right-of-use assets obtained in exchange of operating lease obligations | ||||||||||||
- | 0 | 0 | 0 | 992 | - | - | - | - | - | - | - | - |
Accretion of convertible preferred stock to redemption value | ||||||||||||
- | - | - | - | - | - | - | - | - | 6 | 18 | 17 | 17 |