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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Cash flows from operating activities        
Net loss $ (14,073) $ (12,891) $ (30,105) $ (36,461)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities        
Depreciation and amortization 854 944 2,612 2,916
Stock-based compensation expense 4,664 3,670 13,200 10,562
(Recovery of) provision for doubtful accounts (691) (92) (259) 78
Realized gain on sale of available-for-sale securities, net 0 0 0 (6)
Amortization of premiums and discounts on marketable securities, net 24 36 83 111
Recognition of deferred government grant obligation (207) (247) (943) (910)
Deferred income tax 0 5 0 (7)
Changes in assets and liabilities:        
Accounts receivable (757) (4,009) (1,299) (6,734)
Deferred commissions (179) (135) (330) (264)
Other receivables 468 (365) 443 (447)
Prepaid expenses and other 5,123 415 3,097 (1,098)
Other assets (87) (455) (74) (841)
Accounts payable 669 279 1,008 380
Deferred revenue 5,904 13,228 24,398 15,412
Accrued expenses and other liabilities 3,474 2,410 (83) (3,012)
Net cash provided by (used in) operating activities 5,186 2,793 11,748 (20,321)
Cash flows from investing activities        
Purchase of property and equipment (987) (91) (1,134) (1,100)
Purchase of marketable securities (5,017) 0 (11,367) (802)
Maturities of marketable securities 2,830 0 7,681 0
Sale of marketable securities 0 0 0 7,197
Purchase of intangible assets (55) (38) (144) (152)
Net cash (used in) provided by investing activities (3,229) (129) (4,964) 5,143
Cash flows from financing activities        
Proceeds from option exercises 1,154 840 6,669 1,360
Taxes paid related to net share settlements of stock-based compensation awards 0 0 (936) (761)
Repayment of other long-term debt (53) 0 (73) (18)
Principal payments on capital lease and financing obligations (348) (538) (1,135) (1,446)
Proceeds from government grants 0 0 22 183
Deferred financing costs (71) 0 (81) (33)
Net cash provided by (used in) financing activities 682 302 4,466 (715)
Effect of foreign exchange rates on cash 93 (9) 187 (15)
Net increase (decrease) in cash and cash equivalents 2,732 2,957 11,437 (15,908)
Cash and cash equivalents at beginning of period 59,986 39,885 51,281 58,750
Cash and cash equivalents at end of period 62,718 42,842 62,718 42,842
Supplemental cash flow disclosure        
Cash paid for interest 447 600 1,194 1,392
Cash paid for income taxes, net of refunds 2 (26) 42 22
Supplemental disclosure of noncash investing and financing activities        
Allowance for tenant improvements 0 80 0 481
Purchases of property and equipment, accrued but not paid $ 0 $ 505 $ 0 $ 505