| 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 activities: | ||||||||||||||||||||||||
Net loss | ||||||||||||||||||||||||
-17,533 | -7,957 | -12,848 | -11,384 | -10,805 | -5,030 | -7,596 | -4,160 | -6,136 | -3,152 | -4,261 | -2,269 | -6,681 | -4,816 | -6,226 | -5,959 | -8,221 | -5,745 | -9,738 | -5,813 | -5,338 | -3,686 | -5,885 | -4,382 | -4,409 |
Adjustments to reconcile net loss to cash used in operating activities: | ||||||||||||||||||||||||
Depreciation and amortization | ||||||||||||||||||||||||
496 | 681 | 717 | 681 | 588 | 605 | 442 | 423 | 414 | 390 | 385 | 361 | 328 | 334 | 292 | 279 | 261 | 285 | 238 | 163 | 140 | 201 | 153 | 146 | 135 |
Amortization of right-of-use assets | ||||||||||||||||||||||||
538 | 381 | 298 | 289 | 266 | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
Stock-based compensation expense | ||||||||||||||||||||||||
4,356 | 5,534 | 5,249 | 5,497 | 3,869 | 2,883 | 3,607 | 3,605 | 3,138 | 2,543 | 2,505 | 2,469 | 2,303 | 1,839 | 1,801 | 1,940 | 1,887 | 1,439 | 1,405 | 1,242 | 778 | 540 | 441 | 387 | 182 |
Amortization of net investment discount | ||||||||||||||||||||||||
83 | 151 | 260 | 413 | 377 | 343 | 292 | 171 | 83 | -8 | -26 | 19 | -4 | -312 | 337 | -290 | 117 | 195 | 267 | 124 | 96 | - | - | - | - |
Change in fair value of convertible preferred stock warrants | ||||||||||||||||||||||||
- | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | 0 | -23 | -65 | 286 |
Forgiveness of notes receivable from related party | ||||||||||||||||||||||||
- | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | 0 | 0 | 0 | 100 |
Changes in operating assets and liabilities: | ||||||||||||||||||||||||
Accounts receivable, net | ||||||||||||||||||||||||
-8,807 | 5,870 | -2,286 | -1,802 | -2,285 | 5,223 | -247 | 373 | -2,322 | 4,909 | -573 | -75 | -2,093 | 4,446 | -3 | 511 | -2,001 | 3,012 | -323 | 781 | -339 | 3,403 | 421 | 131 | 182 |
Inventories, net | ||||||||||||||||||||||||
151 | 151 | 1,223 | 1,590 | 2,184 | -107 | 1,968 | 635 | 24 | -254 | 749 | 880 | 1,486 | -1,556 | 1,272 | 964 | 984 | 212 | 538 | 373 | 279 | -133 | -88 | 305 | 266 |
Prepaid expenses and other assets | ||||||||||||||||||||||||
368 | -1,052 | 1,779 | -531 | -182 | 221 | 630 | -231 | -144 | 676 | 148 | 15 | 75 | -135 | 170 | -522 | 285 | -235 | 415 | 47 | 317 | -70 | 637 | 45 | 96 |
Other non-current assets | ||||||||||||||||||||||||
- | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | -759 | 702 | 95 |
Accounts payable | ||||||||||||||||||||||||
634 | -465 | 1,071 | -547 | -1,295 | 1,856 | 700 | -64 | -406 | 865 | -17 | 218 | -863 | -183 | 838 | -464 | 989 | -1,339 | 809 | 555 | -255 | 53 | 695 | -292 | 189 |
Accrued compensation | ||||||||||||||||||||||||
-2,327 | 63 | 2,930 | -3,455 | 899 | 77 | 3,506 | -1,471 | -2,983 | 1,916 | 2,288 | -375 | -829 | 1,022 | 2,189 | -123 | -2,524 | 886 | 2,121 | 2,287 | -791 | 866 | 923 | 887 | -546 |
Other liabilities | ||||||||||||||||||||||||
-325 | -410 | -531 | -387 | -320 | -169 | 91 | -254 | -6 | 26 | -71 | -138 | -58 | -364 | -67 | -308 | -208 | 74 | 473 | 357 | 55 | 147 | -64 | -6 | 156 |
Net cash used in operating activities | ||||||||||||||||||||||||
-5,956 | -7,293 | -4,090 | -8,976 | -6,892 | -5,458 | -1,893 | -2,869 | -3,620 | -2,735 | 531 | -573 | -5,264 | -4,939 | -2,621 | -5,532 | -6,967 | -7,174 | -5,055 | -2,286 | -5,572 | -4,941 | -3,959 | -4,508 | -4,546 |
Purchases of short-term investments | ||||||||||||||||||||||||
7,339 | 12,404 | 28,521 | 26,803 | 42,539 | 34,079 | 27,839 | 37,081 | 31,502 | 28,054 | 26,976 | 39,418 | 22,174 | 37,923 | 23,327 | 50,996 | 41,673 | 45,745 | 40,086 | 90,555 | 8,286 | - | - | - | - |
Maturities of short-term investments | ||||||||||||||||||||||||
23,872 | 21,400 | 34,020 | 32,155 | 45,310 | 36,982 | 27,401 | 36,950 | 21,282 | 29,430 | 29,041 | 41,144 | 28,536 | 35,965 | 28,441 | 32,626 | 52,099 | 63,802 | 34,288 | 10,373 | 14,548 | - | - | - | - |
Purchases of property and equipment | ||||||||||||||||||||||||
137 | 1,114 | 821 | 575 | 1,217 | 874 | 693 | 205 | 344 | 574 | 726 | 527 | 454 | 455 | 572 | 534 | 508 | 321 | 295 | 615 | 293 | 76 | 45 | 110 | 136 |
Net cash provided by investing activities | ||||||||||||||||||||||||
16,396 | 7,882 | 4,678 | 4,777 | 1,554 | 2,029 | -1,131 | -336 | -10,564 | 802 | 1,339 | 1,199 | 5,908 | -2,413 | 4,542 | -18,904 | 9,918 | 21,744 | -6,093 | -78,289 | 5,969 | -838 | -34,435 | -110 | -136 |
Financing activities: | ||||||||||||||||||||||||
Proceeds from issuance of common stock and exercise of stock options | ||||||||||||||||||||||||
3,101 | 9,709 | 408 | 4,964 | 4,467 | 2,741 | 1,373 | 4,482 | 4,873 | 3,214 | 2,663 | 2,758 | 136 | 787 | 114 | 865 | 200 | 926 | 192 | 228 | 424 | 42 | 96 | 58 | 36 |
Repayments related to equipment loans | ||||||||||||||||||||||||
- | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | 0 | 1,037 | 165 | 163 |
Repayments related to capital lease financing | ||||||||||||||||||||||||
- | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | 64 | 8 | 8 | 7 |
Net cash provided by financing activities | ||||||||||||||||||||||||
3,101 | 9,709 | 408 | 4,964 | 4,467 | 2,741 | 1,373 | 4,482 | 4,873 | 3,214 | 2,663 | 2,758 | 136 | 787 | 114 | 865 | 200 | 926 | 185 | 96,627 | 424 | -51 | 54,882 | -115 | -134 |
Net increase (decrease) in cash and cash equivalents | ||||||||||||||||||||||||
13,541 | 10,298 | 996 | 765 | -871 | -688 | -1,651 | 1,277 | -9,311 | 1,281 | 4,533 | 3,384 | 780 | -6,565 | 2,035 | -23,571 | 3,151 | 15,496 | -10,963 | 16,052 | 821 | -5,830 | 16,488 | -4,733 | -4,816 |
Non-cash investing activities: | ||||||||||||||||||||||||
Right-of-use asset obtained in exchange for lease obligations | ||||||||||||||||||||||||
0 | 0 | 0 | 0 | 117 | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
Property and equipment included in accounts payable | ||||||||||||||||||||||||
321 | -266 | -70 | 94 | 346 | 328 | 350 | 162 | 21 | 49 | -24 | 20 | 101 | - | - | - | - | - | - | - | - | - | - | - | - |
Lessor funded building improvements | ||||||||||||||||||||||||
0 | - | 0 | 0 | 152 | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - |