Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Cash flows from operating activities
Net income	$ 2,310	$ 100
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation and amortization	5,453	6,306
Stock-based compensation expense	3,439	2,056
Investment and debt related amortization	28	28
Loss (gain) on disposal of property and equipment	31	(118)
Allowance for doubtful accounts	(339)	51
Write-down of inventories	742	1,317
Foreign currency remeasurement and other, net	570	291
Change in assets and liabilities, net of effects of acquisitions:
Accounts receivable	(3,628)	1,228
Inventories	3,037	(6,883)
Prepaid expenses and other assets	(2,122)	2,041
Accounts payable	3,178	(624)
Accrued and other liabilities	(7,515)	1,653
Net cash provided by operating activities	5,184	7,446
Cash flows from investing activities
Purchase of property, plant and equipment	(4,650)	(2,160)
Proceeds from sale of property, plant and equipment and other assets	6	103
Purchase of marketable securities	(32,045)
Proceeds from sale of marketable securities	15,516
Proceeds from maturity of securities	1,500
Change in restricted cash	18	8,968
Net cash (used in) provided by investing activities	(19,655)	6,911
Cash flows from financing activities
Proceeds from exercise of stock options and issuance of stock under ESPP	1,233	20
Tax withholding on restricted stock units	(34)	(185)
Payments for public stock offering		(233)
Proceeds from bank loans	23,800	12,134
Repayment of bank and acquisition-related loans	(24,017)	(7,695)
Proceeds from issuance of notes payable	4,984	5,575
Repayment of notes payable	(5,047)	(5,478)
Net cash provided by financing activities	919	4,138
Effect of exchange rates on cash and cash equivalents	203	472
Net (decrease) increase in cash and cash equivalents	(13,349)	18,967
Cash and cash equivalents at the beginning of the period	76,088	43,035
Cash and cash equivalents at the end of the period	62,739	62,002
Supplemental disclosure of noncash investing and financing activities:
Changes in unpaid property, plant and equipment	$ (1,355)	164
Modification of bank loan with Comerica		15,786
Issuance of note to seller of acquired business		15,482
Transfer of restricted investments to short-term investments		$ 8,296