CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Cash flows from operating activities:
Net income (loss)	$ 98	$ (5,671)
Adjustments to reconcile net income (loss) from operations to net cash provided by (used in) operations:
Depreciation and amortization of intangible assets	3,019	2,862
Loss (gain) on disposal of assets	88
Deferred tax benefit	(306)	(4)
Stock-based compensation	1,350	552
Changes in operating assets and liabilities:
Accounts receivable, net	(1,817)	79
Inventories, net	1,445	(813)
Contract assets	(564)	2,578
Accounts payable	(1,663)	7,797
Income taxes payable	(4,707)	(3,491)
Accrued expenses	(2,104)	(5,560)
Deferred compensation	418	(126)
Deferred revenue	4,166	(455)
Other assets and liabilities	(1,775)	(1,485)
Net cash used in operating activities	(2,352)	(3,737)
Cash flows from investing activities:
Purchase of short term investments	(6,642)	(4,475)
Maturities of short term investments	6,500	2,000
Additions to property and equipment	(1,516)	(176)
Other	(13)
Net cash provided by (used in) investing activities	(1,671)	(2,651)
Cash flows from financing activities:
Tax payments for restricted stock issuances	(293)	(218)
Net cash used in financing activities	(293)	(218)
Effect of exchange rate changes on cash	(342)	(195)
Net decrease in cash	(4,658)	(6,801)
Cash, cash equivalents, and restricted cash, beginning of period	85,129	77,555
Cash, cash equivalents, and restricted cash, end of period	$ 80,471	$ 70,754