CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash flows from operating activities:
Net income (loss) from operations	$ 8,789	$ 3,846	$ (22,399)
Adjustments to reconcile net income (loss) from operations to net cash provided by (used in) operations:
Depreciation, amortization, and impairment of intangible assets	11,545	12,138	10,601
Loss (gain) on disposal of assets	69	(49)	185
Deferred tax expense (benefit)	(1,624)	(7,431)	13,053
Stock-based compensation	3,368	3,973	3,466
Changes in operating assets and liabilities:
Accounts receivable, net	(3,414)	(11,960)	(8,428)
Inventories, net	(5,391)	(2,388)	5,380
Contract assets	655	(3,110)
Accounts payable	3,628	(1,475)	(1,013)
Income taxes payable	318	(2,541)	11,926
Accrued expenses	(1,286)	2,211	2,514
Deferred compensation	(334)	(291)	(77)
Deferred revenue	1,465	9,538	3,704
Other assets and liabilities	456	(1,235)	(1,285)
Net cash provided by operating activities	18,244	1,226	17,627
Cash flows from investing activities:
Purchase of short term investments	(33,839)	(22,820)	(178,658)
Maturities of short term investments	31,399	80,000	195,000
Purchase of Dealflo, net of cash acquired		(53,065)
Additions to property and equipment	(7,453)	(3,685)	(3,088)
Other		(236)	(456)
Net cash provided by (used in) investing activities	(9,893)	194	12,798
Cash flows from financing activities:
Tax payments for restricted stock issuances	(569)	(970)	(640)
Net cash used in financing activities	(569)	(970)	(640)
Effect of exchange rate changes on cash	(208)	(1,556)	(469)
Net increase (decrease) in cash	7,574	(1,106)	29,316
Cash, cash equivalents, and restricted cash, beginning of period	77,555	78,661	49,345
Cash, cash equivalents, and restricted cash, end of period	85,129	77,555	78,661
Supplemental cash flow disclosures:
Cash paid for income taxes	$ 7,839	$ 10,884	$ 6,427