Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Cash flows from operating activities:
Net loss from continuing operations	$ (8,617)	$ (10,665)
Total loss from discontinued operations	0	(136)
Adjustments required to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization expense	1,153	3,198
Bad debt expense	110	190
Amortization of acquired technology	143	0
Amortization of operating lease right-of-use asset	2,965	0
Loss on disposal of property and equipment	128	41
Stock-based compensation expense	4,971	2,769
Deferred tax benefit	67	0
Net changes in operating assets and liabilities:
Increase in accounts receivable	(10,197)	(7,260)
Increase in prepaid expenses, other current assets	(765)	(1,828)
Increase in accounts payable and accrued expenses	27,827	14,842
Decrease in other current liabilities	(60)	(408)
Decrease in operating lease liability	(3,463)	0
Increase in deferred rent and security deposits payable	7	656
Decrease in other liabilities	(10)	(605)
Net cash provided by operating activities	14,259	794
Cash flows from investing activities:
Purchase of property and equipment	(230)	(2,622)
Acquisition, net of cash received	0	(4,856)
Net cash used in investing activities	(230)	(7,478)
Cash flows from financing activities:
Contingent consideration on acquisition	(1,500)	0
Proceeds from the exercise of stock options awards	5,869	1,776
Proceeds from issuance of common stock under employee stock purchase plan	509	523
Tax withholdings related to net share settlements of restricted stock unit awards (RSUs)	(1,110)	(1,179)
Net cash provided by financing activities	3,768	1,120
Net increase (decrease) in cash and cash equivalents	17,797	(5,564)
Effect of exchange rate changes in cash and cash equivalents	293	(189)
Cash, cash equivalents at beginning of period	47,659	76,320
Cash, cash equivalents at end of period	65,749	70,567
Supplemental disclosure of cash flow activities:
Cash paid for income taxes	49	58
Cash paid for operating leases subject to ASU 842	5,107
Supplemental disclosure of non-cash investing and financing activities:
Contingent consideration related to acquisition	0	1,443
Deferred tax liability related to acquisition	0	1,092
Cash holdback related to acquisition	$ 0	$ 472