| 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 | ||||||||||||||||||||||||
4,247 | 3,432 | 5,663 | 5,246 | 7,889 | 9,772 | 9,851 | 11,833 | 11,959 | 11,216 | 6,263 | 4,078 | 1,982 | 9,201 | 964 | 1,428 | 3,260 | 7,027 | 15,211 | 7,469 | 4,700 | 1,916 | 942 | 932 | 1,383 |
Selling and marketing | ||||||||||||||||||||||||
7,855 | - | - | - | 1,118 | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
General and administrative | ||||||||||||||||||||||||
7,142 | 10,558 | 8,634 | 6,695 | 4,625 | 5,209 | 8,582 | 11,409 | 9,027 | 4,130 | 2,807 | 2,280 | 2,931 | 10,565 | 905 | 1,091 | 2,520 | 2,203 | 1,768 | 1,729 | 1,937 | 1,341 | 922 | 1,050 | 1,101 |
Total operating expenses | ||||||||||||||||||||||||
19,244 | 12,872 | 14,297 | 11,941 | 13,632 | 14,981 | 18,433 | 23,242 | 20,986 | 15,346 | 9,070 | 6,358 | 4,913 | 24,471 | 1,870 | 2,519 | 5,781 | 9,231 | 16,980 | 9,199 | 6,637 | 3,257 | 1,865 | 1,982 | 2,484 |
Loss from operations | ||||||||||||||||||||||||
-19,244 | -12,872 | -14,297 | -11,941 | -13,632 | -14,981 | -18,433 | -23,242 | -20,986 | -15,346 | -9,070 | -6,358 | -4,913 | -24,471 | -1,870 | -2,519 | -5,781 | -9,231 | -16,980 | -9,199 | -6,637 | -3,257 | -1,865 | -1,982 | -2,484 |
Other income (expense): | ||||||||||||||||||||||||
Interest income | ||||||||||||||||||||||||
102 | 120 | 212 | 108 | 18 | 30 | 35 | 32 | 30 | 33 | 32 | 32 | 31 | 26 | 13 | 16 | 19 | 5 | 6 | 6 | 7 | 4 | 1 | 0 | 0 |
Other expense | ||||||||||||||||||||||||
4 | - | - | - | 14 | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
Other income (expense), net | ||||||||||||||||||||||||
- | - | 287 | -7 | - | -30 | -33 | -32 | -50 | -34 | -42 | 64 | -34 | - | - | - | - | - | - | - | - | - | - | - | - |
Loss on issuance of Series D redeemable convertible preferred stock | ||||||||||||||||||||||||
- | - | - | - | - | - | - | - | - | 2,782 | 5,740 | 0 | 0 | - | - | - | - | - | - | - | - | - | - | - | - |
Loss on issuance of warrants | ||||||||||||||||||||||||
- | - | 0 | 0 | - | 0 | 0 | 0 | 47,920 | - | 0 | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
Loss on issuance of Purchase Rights | ||||||||||||||||||||||||
- | - | 0 | 674 | - | - | 0 | 0 | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
Interest expense | ||||||||||||||||||||||||
- | - | - | - | - | - | - | - | - | - | - | - | - | - | 506 | 154 | 265 | 289 | 287 | 285 | 271 | 212 | 132 | 26 | 4 |
Fair Value Adjustment of Warrants | ||||||||||||||||||||||||
0 | 0 | 0 | 3,315 | 4,440 | 0 | 0 | 0 | 0 | - | - | - | - | - | - | - | - | - | - | - | - | -568 | 2,044 | 271 | -886 |
Change in fair value of Purchase Rights | ||||||||||||||||||||||||
- | - | 0 | 19,617 | - | - | 0 | 0 | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
Change in fair value of Series D 2X liquidation preference | ||||||||||||||||||||||||
- | - | 0 | 0 | - | 0 | 0 | 0 | -130 | -1,364 | -59,211 | -250 | -350 | - | - | - | - | - | - | - | - | - | - | - | - |
Total other income (expense), net | ||||||||||||||||||||||||
98 | 155 | 499 | -23,505 | -4,436 | 0 | 2 | 0 | -48,070 | -4,147 | -64,961 | -154 | -353 | - | - | - | - | - | - | - | - | - | - | - | - |
Loss before income tax | ||||||||||||||||||||||||
-19,146 | -12,717 | -13,798 | -35,446 | -18,068 | -14,981 | -18,431 | -23,242 | -69,056 | -19,493 | -74,031 | -6,512 | -5,266 | - | - | - | - | - | - | - | - | - | - | - | - |
Income tax expense | ||||||||||||||||||||||||
0 | 0 | 0 | 4 | 0 | - | 0 | 2 | - | 0 | 0 | 0 | 3 | - | - | - | - | - | - | - | - | - | - | - | - |
Net Income (Loss) Attributable to Parent | ||||||||||||||||||||||||
-19,146 | -12,717 | -13,798 | -35,450 | -18,068 | -14,981 | -18,431 | -23,244 | -69,056 | -19,493 | -74,031 | -6,512 | -5,269 | -55,620 | -2,362 | -2,657 | -6,026 | -9,515 | -17,262 | -9,477 | -6,902 | -2,896 | -4,040 | -2,279 | -1,602 |
Accretion of Series D redeemable convertible preferred stock dividends | ||||||||||||||||||||||||
- | - | 0 | 0 | - | 0 | 0 | 0 | 66 | 1,178 | 1,054 | 897 | 888 | - | - | - | - | - | - | - | - | - | - | - | - |
Net loss attributable to common stockholders | ||||||||||||||||||||||||
- | - | -13,798 | -35,450 | - | -14,981 | -18,431 | -23,244 | -69,122 | -20,671 | -75,085 | -7,409 | -6,157 | - | - | - | - | - | - | - | - | - | - | - | - |
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 |