CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Cash Flows From Operating Activities:
Net income (loss)	$ 13,274	$ (10,320)
Reconciliation to net cash provided by operating activities:
Impairment of long-lived assets	331	78
Loss on disposal of property, plant, and equipment	663	19
Depreciation of property, plant, and equipment	9,009	8,516
Amortization of product rights, trademarks, and patents	1,751	1,458
Imputed interest accretion	55	83
Employee share-based compensation expense	10,482	8,687
Non-employee share-based compensation expense	1,122	670
Reserve for income tax liabilities		16
Changes in deferred taxes		(3,541)
Changes in operating assets and liabilities:
Accounts receivable, net	6,756	(2,706)
Inventories, net	(19,477)	8,549
Income tax refund and deposits	3,112	21
Prepaid expenses and other assets	173	(6,516)
Income taxes payable	103	(1,083)
Accounts payable and accrued liabilities	(2,800)	3,463
Net cash provided by operating activities	24,554	7,394
Cash Flows From Investing Activities:
Acquisition of business	(12,461)
Purchases of property, plant, and equipment	(14,457)	(10,685)
Capitalized labor, overhead, and interest on self-constructed assets	(1,588)	(1,242)
Proceeds from the sale of property, plant and equipment		51
Purchase of short-term investments	(2,270)
Maturity of short-term investments	1,414
Decrease (increase) in restricted cash	(105)	210
Payment of deposits and other assets	(2,921)	(800)
Net cash used in investing activities	(32,388)	(12,466)
Cash Flows From Financing Activities:
Repurchase of common stock	(1,342)	(857)
Net proceeds from equity plans	18,499	11,539
Payments on treasury stock	(8,986)	(5,687)
Proceeds from issuance of long-term debt	10,198	6,786
Principal payments on long-term debt	(9,968)	(3,973)
Net cash provided by financing activities	8,401	7,808
Effect of exchange rate changes on cash	(43)	117
Net increase in cash and cash equivalents	524	2,853
Cash and cash equivalents at beginning of period	66,074	67,828
Cash and cash equivalents at end of period	66,598	70,681
Noncash Investing and Financing Activities:
Equipment acquired under capital leases	1,263	150
Supplemental Disclosures of Cash Flow Information:
Interest paid	1,381	1,345
Income taxes paid	$ 3,263	$ 45