CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Cash flows from operating activities:
Net loss	$ (17,921)	$ (88)
Reconciliation of net loss to net cash used in operating activities
Depreciation and amortization of fixed assets	1,133	822
Provision for bad debt expense	811	26
Provision for write down of inventory	1,154	918
Stock based compensation	1,103	1,739
Amortization of debt issuance costs	505	456
Amortization of intangible assets	1,550	1,396
Foreign currency exchange loss (gain)	1,895	(4,901)
Partial extinguishment of Convertible 3.75% Senior Notes	2,467	0
Amortization of debt discount	4,422	4,183
Loss on impairment of intangible assets	22	0
Changes in operating assets and liabilities
Accounts receivable	(4,227)	(4,008)
Inventories	(2,816)	(2,554)
Prepaid expenses and other current receivables	1,443	(208)
Other assets	35	20
Accounts payable and accrued expenses	(4,086)	892
Net cash used in operating activities	(12,510)	(1,307)
Cash flows from investing activities:
Capital expenditures	(12,523)	(15,286)
Net cash used in investing activities	(12,523)	(15,286)
Cash flows from financing activities:
Proceeds from exercise of common stock options	12	267
Proceeds from 2021 Term Loan	15,000	0
Debt fees on Convertible 4.75% Senior Notes and 2021 Term Loan	(2,457)	0
Net cash provided by financing activities	12,555	267
Effect of exchange rate on cash and cash equivalents	(540)	536
Net decrease in cash, cash equivalents and restricted cash	(12,478)	(16,326)
Cash, cash equivalents and restricted cash at beginning of period	27,165	66,481
Cash, cash equivalents and restricted cash at end of period	14,147	50,691
Supplemental Cash flow information:
Cash payments for interest	2,475	2,695
Cash payments for income taxes	48	93
Non cash operating, investing and financing transactions:
Acquisition of capital expenditures in accounts payable and accrued expenses	3,042	4,260
Capitalized interest in capital expenditures	477	0
Capitalized stock compensation in capital expenditures	$ 63	$ 66