| Dec'19 | Dec'18 | Dec'17 | Dec'16 | Dec'15 | Dec'14 | Dec'13 | Dec'12 | Dec'11 |
|---|---|---|---|---|---|---|---|---|
Operating activities | ||||||||
Cash flows from operating activities | ||||||||
Net loss | ||||||||
-151,811 | -171,453 | -19,626 | -58,528 | -20,140 | -38,313 | -261 | 8,362 | 6,717 |
Adjustments to reconcile net loss to net cash used in operating activities: | ||||||||
Depreciation and amortization expense | ||||||||
10,845 | 8,279 | 7,228 | 7,608 | 2,863 | 1,822 | 1,193 | 960 | 1,147 |
Stock-based compensation | ||||||||
19,571 | 16,520 | 14,744 | 12,165 | 7,847 | 3,244 | 862 | 838 | 2,347 |
Fair value adjustment of warrant liability | ||||||||
- | - | - | - | - | - | 626 | -151 | -1,459 |
Changes in operating assets and liabilities: | ||||||||
Accounts receivable | ||||||||
-16,839 | 15,941 | 10,878 | 1,540 | -1,711 | 931 | -42 | -1,352 | -12,551 |
Prepaid expenses | ||||||||
4,878 | 3,255 | -332 | 1,677 | -2,405 | 3,239 | 834 | 91 | -76 |
Restricted cash | ||||||||
- | - | - | - | -300 | -105 | 0 | -177 | 0 |
Other assets | ||||||||
1,578 | 4,580 | -262 | -276 | 285 | 1,179 | 375 | -1 | 133 |
Accounts payable | ||||||||
787 | 1,554 | -1,544 | 2,232 | -163 | -1,500 | -570 | -7,312 | -10,271 |
Accrued expenses | ||||||||
-6,057 | 3,506 | 12,832 | 4,659 | 3,545 | 4,346 | 2,347 | 185 | 272 |
Lease liabilities | ||||||||
2,881 | 0 | 0 | - | - | - | - | - | - |
Lease exit liability | ||||||||
- | - | - | - | -3,293 | -1,439 | -629 | -534 | -447 |
Deferred revenue | ||||||||
-20,869 | 13,405 | 6,533 | -4,191 | -12,223 | 3,317 | -16,676 | -10,810 | -4,275 |
Deferred rent | ||||||||
0 | -971 | 6,115 | -1,134 | 4,650 | -234 | 103 | 441 | 232 |
Other liabilities | ||||||||
0 | -298 | -1,593 | -3,549 | -878 | 1,242 | 0 | - | - |
Net cash used in operating activities | ||||||||
-134,270 | -153,234 | 14,405 | -43,679 | -13,661 | -32,759 | -14,172 | -6,582 | 6,757 |
Cash flows from investing activities | ||||||||
Cash flows from investing activities | ||||||||
Purchases of marketable securities | ||||||||
264,399 | 132,750 | 135,122 | 347,762 | 142,910 | 0 | 0 | - | - |
Proceeds from sale and maturities of marketable securities | ||||||||
189,330 | 214,348 | 242,401 | 288,894 | 0 | 0 | - | - | - |
Purchases of property and equipment | ||||||||
4,289 | 24,954 | 29,403 | 11,381 | 9,197 | 3,572 | 2,961 | 940 | 500 |
Net cash provided by (used in) investing activities | ||||||||
-79,358 | 56,644 | 77,876 | -70,249 | -152,107 | -3,572 | -2,961 | -940 | -500 |
Cash flows from financing activities | ||||||||
Cash flows from financing activities | ||||||||
Proceeds from issuance of preferred stock | ||||||||
- | - | - | - | - | - | - | - | 12,014 |
Proceeds from issuance of common stock, net of offering costs | ||||||||
118,657 | 103,259 | 34,244 | 0 | 203,467 | 76,716 | 84,771 | - | 70 |
Proceeds from stock option exercises and ESPP purchases | ||||||||
1,315 | 1,992 | 1,144 | 1,893 | 911 | 744 | 1,100 | 47 | - |
Purchase of treasury stock | ||||||||
0 | 260 | 40 | 39 | 29 | 19 | 0 | - | - |
Net cash provided by financing activities | ||||||||
119,972 | 104,991 | 35,348 | 1,854 | 204,349 | 77,441 | 85,871 | 47 | 12,085 |
Net change in cash and cash equivalents | ||||||||
-93,656 | 8,401 | 127,629 | -112,074 | 38,581 | 41,110 | 68,738 | -7,475 | 18,342 |
Supplemental Cash Flow Information [Abstract] | ||||||||
Right-of-use assets modified in exchange for operating lease obligations | ||||||||
6,408 | 0 | 0 | - | - | - | - | - | - |
Fair value of warrants received | ||||||||
0 | 6,130 | 0 | 0 | - | - | - | - | - |
Conversion of preferred stock | ||||||||
- | - | - | - | - | - | 2,947 | - | 0 |