CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Cash flows from operating activities:
Net income	$ 5,496	$ 6,542
Adjustments to reconcile net income to net cash used in operating activities:
Depreciation and amortization	2,465	2,295
Non-cash interest expense	382
Stock-based compensation expense	2,059	1,687
Deferred tax expense	218	173
Loss on revaluation of contingent consideration	2,642	1,881
Gain on sale of fixed assets	(15)
Loss on disposal of assets	26	1
Changes in assets and liabilities:
Accounts receivable	892	(6,820)
Other receivables	(318)	(283)
Inventories	(5,093)	(2,380)
Prepaid expenses and other current assets	793	981
Accounts payable	511	586
Accrued liabilities	(3,239)	875
Long-term liabilities	(66)	(425)
Net cash provided by operating activities	6,753	5,113
Cash flows from investing activities:
Acquisition of Atoll GmbH, net of cash received	(8,767)
Purchases of marketable securities	(3,952)	(8,119)
Redemptions of marketable securities	14,100	10,359
Proceeds from sale of fixed assets	45
Purchases of property, plant and equipment	(1,406)	(1,737)
Net cash provided by investing activities	20	503
Cash flows from financing activities:
Proceeds from issuance of convertible senior notes, net of costs	111,323
Exercise of stock options	958	686
Payment of contingent considerations	(498)	(99)
Net cash provided by financing activities	111,783	587
Effect of exchange rate changes on cash and cash equivalents	(26)	(1,554)
Net increase in cash and cash equivalents	118,530	4,649
Cash and cash equivalents, beginning of period	54,092	35,363
Cash and cash equivalents, end of period	172,622	40,012
Supplemental disclosure of non-cash activities:
Income taxes paid	1,981	$ 1,629
Payment of contingent consideration in common stock	875
Stock tendered for acquisition of Atoll GmbH	$ 14,135