| 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 | Dec'15 | Sep'15 | Jun'15 | Mar'15 | Dec'14 | Sep'14 | Jun'14 | Mar'14 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Operating expenses: | ||||||||||||||||||||||||
Research and development | ||||||||||||||||||||||||
18,588 | 22,230 | 28,570 | 32,758 | 39,345 | 43,415 | 44,859 | 41,271 | 33,516 | 23,539 | 21,524 | 16,226 | 13,576 | 14,855 | 12,681 | 26,927 | 32,969 | 34,409 | 29,298 | 15,029 | 8,492 | 5,174 | 0 | 0 | 0 |
Selling and marketing | ||||||||||||||||||||||||
0 | - | - | - | 0 | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
General and administrative | ||||||||||||||||||||||||
33,029 | 30,512 | 25,163 | 25,111 | 29,825 | 34,227 | 33,148 | 27,373 | 18,244 | 12,148 | 18,583 | 16,681 | 15,493 | 15,083 | 6,721 | 7,585 | 8,222 | 7,639 | 6,776 | 5,930 | 5,251 | 4,416 | 0 | 0 | 0 |
Total operating expenses | ||||||||||||||||||||||||
58,354 | 52,742 | 54,851 | 58,987 | 70,288 | 77,642 | 78,007 | 68,644 | 51,760 | 35,687 | 44,812 | 37,612 | 33,774 | 34,643 | 19,402 | 34,512 | 41,192 | 42,049 | 36,075 | 20,960 | 13,744 | 9,591 | 0 | 0 | 0 |
Loss from operations | ||||||||||||||||||||||||
-58,354 | -52,742 | -54,851 | -58,987 | -70,288 | -77,642 | -78,007 | -68,644 | -51,760 | -35,687 | -44,812 | -37,612 | -33,774 | -34,643 | -19,402 | -34,512 | -41,192 | -42,049 | -36,075 | -20,960 | -13,744 | -9,591 | 0 | 0 | 0 |
Other income (expense): | ||||||||||||||||||||||||
Interest income | ||||||||||||||||||||||||
542 | 458 | 368 | 191 | 115 | 127 | 130 | 127 | 127 | 128 | 121 | 103 | 88 | 77 | 55 | 47 | 38 | 26 | 24 | 19 | 14 | 7 | 0 | 0 | 0 |
Other expense | ||||||||||||||||||||||||
0 | - | - | - | 0 | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
Other income (expense), net | ||||||||||||||||||||||||
- | - | 236 | -84 | - | -145 | -149 | -158 | -62 | -46 | 0 | 0 | 0 | - | - | - | - | - | - | - | - | - | - | - | - |
Loss on issuance of Series D redeemable convertible preferred stock | ||||||||||||||||||||||||
- | - | - | - | - | - | - | - | - | 8,522 | 0 | 0 | 0 | - | - | - | - | - | - | - | - | - | - | - | - |
Loss on issuance of warrants | ||||||||||||||||||||||||
- | - | 0 | 0 | - | 47,920 | 0 | 0 | 0 | - | 0 | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
Loss on issuance of Purchase Rights | ||||||||||||||||||||||||
- | - | 0 | 0 | - | - | 0 | 0 | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
Interest expense | ||||||||||||||||||||||||
- | - | - | - | - | - | - | - | - | - | - | - | - | - | 1,214 | 996 | 1,127 | 1,133 | 1,057 | 901 | 642 | 374 | 0 | 0 | 0 |
Fair Value Adjustment of Warrants | ||||||||||||||||||||||||
3,315 | 7,755 | 7,755 | 7,755 | 4,440 | 0 | 0 | 0 | 0 | - | - | - | - | - | - | - | - | - | - | - | - | 860 | 0 | 0 | 0 |
Change in fair value of Purchase Rights | ||||||||||||||||||||||||
- | - | 0 | 0 | - | - | 0 | 0 | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
Change in fair value of Series D 2X liquidation preference | ||||||||||||||||||||||||
- | - | 0 | 0 | - | -130 | -1,494 | -60,705 | -60,955 | -61,175 | 0 | 0 | 0 | - | - | - | - | - | - | - | - | - | - | - | - |
Total other income (expense), net | ||||||||||||||||||||||||
-22,753 | -27,287 | -27,442 | -27,939 | -4,434 | -48,068 | -52,215 | -117,178 | -117,332 | -69,615 | 0 | 0 | 0 | - | - | - | - | - | - | - | - | - | - | - | - |
Loss before income tax | ||||||||||||||||||||||||
-81,107 | -80,029 | -82,293 | -86,926 | -74,722 | -125,710 | -130,222 | -185,822 | -169,092 | -105,302 | 0 | 0 | 0 | - | - | - | - | - | - | - | - | - | - | - | - |
Income tax expense | ||||||||||||||||||||||||
4 | 4 | 4 | 6 | 0 | - | 0 | 0 | - | 3 | 0 | 0 | 0 | - | - | - | - | - | - | - | - | - | - | - | - |
Net Income (Loss) Attributable to Parent | ||||||||||||||||||||||||
-81,111 | -80,033 | -82,297 | -86,930 | -74,724 | -125,712 | -130,224 | -185,824 | -169,092 | -105,305 | -141,432 | -69,763 | -65,909 | -66,667 | -20,561 | -35,461 | -42,281 | -43,157 | -36,538 | -23,317 | -16,119 | -10,819 | 0 | 0 | 0 |
Accretion of Series D redeemable convertible preferred stock dividends | ||||||||||||||||||||||||
- | - | 0 | 0 | - | 66 | 1,244 | 2,298 | 3,195 | 4,017 | 0 | 0 | 0 | - | - | - | - | - | - | - | - | - | - | - | - |
Net loss attributable to common stockholders | ||||||||||||||||||||||||
- | - | -82,297 | -86,930 | - | -125,778 | -131,468 | -188,122 | -172,287 | -109,322 | 0 | 0 | 0 | - | - | - | - | - | - | - | - | - | - | - | - |
Net loss per share, basic and diluted (in dollars per share) | ||||||||||||||||||||||||
-0.40 | -0.05 | -0.30 | -0.97 | -0.67 | 0.70 | -0.71 | -1.11 | -4.62 | -10.55 | -38.31 | -3.78 | -3.14 | -0.09 | -0.17 | -0.19 | -0.44 | -16.46 | -1.26 | -0.69 | -0.50 | 9.08 | -7.31 | -4.13 | -3.00 |
Weighted-average shares used to compute net loss per share, basic and diluted (in shares) | ||||||||||||||||||||||||
48,195 | 51,058 | 46,239 | 36,732 | 26,883 | 25,980 | 25,778 | 20,868 | 14,974 | 1,959 | 1,959 | 1,959 | 1,959 | 264,829 | 13,816 | 13,800 | 13,757 | -31,919 | 13,702 | 13,676 | 13,671 | 6,431 | 552 | 552 | 533 |