CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Cash flows from operating activities:
Net income	$ 16,148	$ 6,185
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	9,053	7,894
Non-cash interest expense	2,231	2,089
Stock-based compensation expense	6,283	4,893
Deferred tax expense	889	325
Other	3	1
Changes in operating assets and liabilities, excluding impact of acquisitions:
Accounts receivable	(7,317)	(4,788)
Royalties and other receivables	114	60
Unbilled receivables	2,142
Inventories	(4,137)	(3,096)
Prepaid expenses and other assets	114	(144)
Operating lease right of use assets	1,206
Other assets	(65)	(1,241)
Accounts payable	495	(701)
Accrued expenses	1,642	(3,985)
Operating lease liability	(1,216)
Long-term liabilities	(8)	43
Total cash provided by operating activities	27,577	7,535
Cash flows from investing activities:
Acquisition of C Technologies, Inc., net of cash acquired	(182,176)
Additions to capitalized software costs	(3,282)
Purchases of property, plant and equipment	(5,847)	(4,412)
Total cash used in investing activities	(191,305)	(4,412)
Cash flows from financing activities:
Exercise of stock options	566	1,490
Proceeds from issuance of common stock, net	189,623
Repayment of senior convertible notes	(17)	(11)
Total cash provided by financing activities	190,172	1,479
Effect of exchange rate changes on cash, cash equivalents and restricted cash	(2,449)	(2,750)
Net increase in cash, cash equivalents and restricted cash	23,995	1,852
Cash, cash equivalents and restricted cash, beginning of period	193,822	173,759
Cash, cash equivalents and restricted cash, end of period	217,817	175,611
Supplemental disclosure of cash flow information:
Income taxes paid	2,705	1,458
Supplemental disclosure of non-cash investing and financing activities:
Fair value of common stock issued for acquisition of C Technologies, Inc.	$ 53,938
Non-cash effect of adoption of ASU 2016-16		$ 5,609