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CONSOLIDATED 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 loss $ (44,426) $ (43,977) $ (43,399)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities      
Depreciation and amortization 3,546 3,820 4,410
Stock-based compensation expense 19,476 14,247 11,000
(Recovery of) provision for doubtful accounts (517) 185 449
Realized gain on sale of available-for-sale securities, net 0 (6) (13)
Amortization of premiums and discounts on marketable securities, net 101 147 77
Recognition of deferred government grant obligation (1,578) (1,141) (2,383)
Deferred income tax 0 (32) (76)
Changes in assets and liabilities:      
Accounts receivable (5,546) (7,101) (5,080)
Deferred commissions (498) (497) (520)
Other receivables 577 (732) (523)
Prepaid expenses 2,952 (5,513) (734)
Other assets 618 (654) 81
Accounts payable 2,206 (3,930) 2,331
Deferred revenue 29,367 34,211 7,297
Accrued expenses and other liabilities (758) 604 5,390
Change in restricted cash 0 0 101
Net cash provided by (used in) operating activities 5,520 (10,369) (21,592)
Cash flows from investing activities      
Purchase of property and equipment (1,188) (1,901) (1,843)
Purchase of marketable securities (14,369) (1,301) (24,069)
Maturities of marketable securities 9,281 0 0
Sale of marketable securities 0 7,197 6,521
Purchase of intangible assets (197) (190) (386)
Net cash (used in) provided by investing activities (6,473) 3,805 (19,777)
Cash flows from financing activities      
Payment of equity issuance costs 0 0 (1,346)
Proceeds from option exercises 12,485 1,597 2,244
Taxes paid related to net share settlements of stock-based compensation awards (1,125) (761) 0
Changes in restricted cash 0 0 300
Repayment of other long-term debt (73) (18) (84)
Principal payments on capital lease and financing obligations (1,435) (1,863) (2,282)
Distributions to members 0 0 (381)
Proceeds from government grants 51 183 548
Deferred financing costs (81) (33) 0
Repayment of government grant 0 0 (101)
Net cash provided by (used in) financing activities 9,822 (895) (1,102)
Effect of foreign exchange rates on cash 183 (10) 90
Net increase (decrease) in cash and cash equivalents 9,052 (7,469) (42,381)
Cash and cash equivalents at beginning of year 51,281 58,750 101,131
Cash and cash equivalents at end of year 60,333 51,281 58,750
Supplemental cash flow disclosure      
Cash paid for interest 1,627 1,835 2,048
Cash paid for income taxes, net of refunds 42 47 64
Supplemental disclosure of noncash investing and financing activities      
Fixed assets acquired through capital lease arrangements 0 0 527
Government grant recorded against property and equipment, net 0 0 908
Allowance for tenant improvements 0 481 698
Purchases of property and equipment, accrued but not paid $ 0 $ 0 $ 354