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Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Cash flows from operating activities      
Net income (loss) $ (48,925) $ 23,625 $ (17,592)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities      
Depreciation and amortization 2,030 1,466 1,113
Amortization of premium on marketable securities 2,845 2,037 1,096
Stock-based compensation 13,651 7,848 4,869
Abandonment of capitalized intangible assets 396 356 296
Loss (gain) on disposal of assets 83   (9)
Gain on sale of marketable securities available-for-sale   (5) (5)
Changes in operating assets and liabilities:      
Accounts receivable 7,474 (8,572) 2,922
Interest receivable (293) (530) (898)
Prepaid expenses and other current assets (2,705) (1,700) (1,068)
Income tax receivable (1,524)    
Other assets (161) (40) (3)
Accounts payable 2,989 (2,520) 4,710
Accrued expenses (1,212) 3,058 1,425
Deferred rent 589 (89) 572
Income tax payable 91 65  
Deferred revenue (9,011) 69,618 29,238
Net cash provided by (used in) operating activities (33,683) 94,617 26,666
Cash flows from investing activities      
Proceeds from sale and maturities of marketable securities 115,757 105,505 34,358
Proceeds from sale of property and equipment     9
Purchase of marketable securities (76,529) (316,149) (215,798)
Purchase of intangible assets (1,967) (1,502) (1,745)
Purchase of property and equipment (5,311) (1,507) (1,930)
Net cash provided by (used in) investing activities 31,950 (213,653) (185,106)
Cash flows from financing activities      
Proceeds from issuance of common stock upon exercise of stock awards 2,797 1,160 554
Proceeds from issuance of common stock under the Employee Stock Purchase Plan 936 545 623
Proceeds from issuance of common stock   126,546 122,906
Common stock issuance cost   (7,277) (7,702)
Net cash provided by financing activities 3,733 120,974 116,381
Net increase (decrease) in cash and cash equivalents 2,000 1,938 (42,059)
Cash and cash equivalents, beginning of period 14,528 12,590 54,649
Cash and cash equivalents, end of period 16,528 14,528 12,590
Cash paid during the period for:      
Interest 13 21 13
Taxes 969 936 1
Supplemental disclosures of non-cash investing activities      
Unrealized loss on marketable securities, net of tax $ 367 $ 925 $ 516