CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Cash flows from operating activities:
Net income	$ 11,506	$ 5,496
Adjustments to reconcile net income to net cash used in operating activities:
Depreciation and amortization	3,278	2,465
Non-cash interest expense	1,956	382
Stock-based compensation expense	3,027	2,059
Deferred tax expense	(5,384)	218
Loss on revaluation of contingent consideration		2,642
Gain on sale of fixed assets		(15)
Loss on disposal of assets	64	26
Changes in assets and liabilities:
Accounts receivable	(6,347)	892
Other receivables	226	(318)
Inventories	(813)	(5,093)
Prepaid expenses and other current assets	(236)	793
Other assets	(754)
Accounts payable	1,740	511
Accrued liabilities	(4,216)	(3,239)
Long-term liabilities	(86)	(66)
Net cash provided by operating activities	3,961	6,753
Cash flows from investing activities:
Acquisition of Atoll GmbH, net of cash received		(8,767)
Purchases of marketable securities	(42)	(3,952)
Redemptions of marketable securities	16,850	14,100
Proceeds from sale of fixed assets		45
Purchases of property, plant and equipment	(2,676)	(1,406)
Net cash provided by investing activities	14,132	20
Cash flows from financing activities:
Proceeds from issuance of convertible senior notes, net of costs		111,323
Exercise of stock options	1,505	958
Payment of contingent considerations	(1,677)	(498)
Net cash (used in) provided by financing activities	(172)	111,783
Effect of exchange rate changes on cash and cash equivalents	2,053	(26)
Net increase in cash and cash equivalents	19,974	118,530
Cash and cash equivalents, beginning of period	122,233	54,092
Cash and cash equivalents, end of period	142,207	172,622
Supplemental disclosure of non-cash activities:
Income taxes paid	2,150	1,981
Payment of contingent consideration in common stock	$ 1,062	875
Stock tendered for acquisition of Atoll GmbH		$ 14,135