Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Operating activities
Net loss	$ (7,909)	$ (12,751)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation and amortization	3,434	3,665
Stock-based compensation	3,500	3,476
Provision for reserves on accounts receivable	23	96
Changes in assets and liabilities:
Accounts receivable	296	(1,606)
Prepaid expenses and other current assets	(488)	(2,421)
Other assets	(276)	92
Accounts payable	924	3,959
Accrued expenses	(62)	(2,457)
Deferred revenue	812	1,233
Net cash provided by (used in) operating activities	254	(6,714)
Investing activities
Purchases of property and equipment	(958)	(650)
Capitalized internal-use software costs	(1,813)	(1,149)
Net cash used in investing activities	(2,771)	(1,799)
Financing activities
Proceeds from exercise of stock options	4,221	277
Payments of withholding tax on RSU vesting	(113)	(118)
Payments on equipment financing	(26)	(152)
Payments under capital lease obligation	(193)	(278)
Net cash provided by (used in) financing activities	3,889	(271)
Effect of exchange rate changes on cash and cash equivalents	(51)	322
Net increase (decrease) in cash and cash equivalents	1,321	(8,462)
Cash and cash equivalents at beginning of period	26,132	36,813
Cash and cash equivalents at end of period	$ 27,453	$ 28,351