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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Cash flows from operating activities    
Net loss $ (9,618) $ (5,836)
Adjustments to reconcile net loss to net cash provided by operating activities    
Depreciation and amortization 872 891
Stock-based compensation expense 5,905 4,139
Provision for doubtful accounts 44 286
Amortization of premiums and discounts on marketable securities, net 18 31
Recognition of deferred government grant obligation (108) (538)
Changes in assets and liabilities:    
Accounts receivable 6,542 2,686
Deferred commissions (1,649) (2)
Other receivables 27 840
Prepaid expenses and other 231 804
Other assets (58) (23)
Accounts payable 2,677 1,017
Deferred revenue (2,345) 4,096
Accrued expenses and other liabilities (755) (5,811)
Net cash provided by operating activities 1,783 2,580
Cash flows from investing activities    
Purchase of property and equipment (9) (121)
Purchase of marketable securities 0 (4,091)
Maturities of marketable securities 500 3,001
Purchase of intangible assets (64) (31)
Net cash provided by (used in) investing activities 427 (1,242)
Cash flows from financing activities    
Proceeds from option exercises 3,075 806
Taxes paid related to net share settlements of stock-based compensation awards (1,342) (936)
Proceeds from shares issued in connection with employee stock purchase plan 1,370 0
Principal payments on capital lease and financing obligations (298) (297)
Net cash provided by (used in) financing activities 2,805 (427)
Effect of foreign exchange rates on cash (92) 12
Net increase in cash and cash equivalents 4,923 923
Cash and cash equivalents at beginning of period 60,333 51,281
Cash and cash equivalents at end of period 65,256 52,204
Supplemental cash flow disclosure    
Cash paid for interest 433 298
Cash paid for income taxes, net of refunds 2 14
Supplemental disclosure of noncash investing and financing activities    
Allowance for tenant improvements 22 0
Purchases of property and equipment, accrued but not paid $ 175 $ 0