CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Cash flows from operating activities:
Net income	$ 25,676	$ 16,148
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	12,869	9,053
Non-cash interest expense	5,415	2,231
Stock-based compensation expense	8,267	6,283
Deferred income taxes, net	(1,912)	889
Other	143	3
Changes in operating assets and liabilities, excluding impact of acquisitions:
Accounts receivable	(6,013)	(7,317)
Royalties and other receivables	184	114
Unbilled receivables		2,142
Inventories	(14,964)	(4,137)
Prepaid expenses and other assets	(1,633)	114
Operating lease right of use assets	1,844	1,206
Other assets	(76)	(65)
Accounts payable	2,884	495
Accrued expenses	(7,012)	1,642
Operating lease liability	(304)	(1,216)
Long-term liabilities	897	(8)
Total cash provided by operating activities	26,265	27,577
Cash flows from investing activities:
Acquisition of C Technologies, Inc., net of cash acquired		(182,176)
Additions to capitalized software costs	(2,226)	(3,282)
Purchases of property, plant and equipment	(7,291)	(5,847)
Total cash used in investing activities	(9,517)	(191,305)
Cash flows from financing activities:
Exercise of stock options and vesting of stock units	5,412	566
Payment of tax withholding obligation on vesting of restricted stock	(10)
Proceeds from issuance of common stock, net		189,623
Repayment of senior convertible notes		(17)
Total cash provided by financing activities	5,402	190,172
Effect of exchange rate changes on cash, cash equivalents and restricted cash	807	(2,449)
Net increase in cash, cash equivalents and restricted cash	22,957	23,995
Cash, cash equivalents and restricted cash, beginning of period	537,407	193,822
Cash, cash equivalents and restricted cash, end of period	560,364	217,817
Supplemental disclosure of non-cash investing and financing activities:
Assets acquired under operating leases	$ 17
Fair value of common stock issued for acquisition of C Technologies, Inc.		$ 53,938