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Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Cash Flows From Operating Activities:    
Net income (loss) $ (8,178) $ 10,033
Reconciliation to net cash provided by (used in) operating activities:    
Impairment of long-lived assets 361 6
Loss on disposal of property, plant, and equipment 44 116
Depreciation and amortization of property, plant, and equipment 9,235 8,187
Amortization of product rights, trademarks, and patents 1,437 1,430
Amortization of imputed interest and debt discount 66  
Employee share-based compensation expense 5,952 4,569
Non-employee share-based compensation expense 728 715
Reserve for income tax liabilities   89
Changes in operating assets and liabilities:    
Accounts receivable, net (2,019) 5,430
Inventories, net 1,609 (8,694)
Income tax refund and deposits 2,690 (92)
Prepaid expenses and other assets (1,318) (468)
Income taxes payable (5,456) (133)
Accounts payable and accrued liabilities 3,578 1,342
Net cash provided by operating activities 8,729 22,530
Cash Flows From Investing Activities:    
Acquisition of business (18,352)  
Purchases of property, plant, and equipment (11,118) (13,896)
Capitalized labor, overhead, and interest on self-constructed assets (555) (507)
Purchase of trademarks and other intangible assets   (43)
Sales of short-term investments, net   513
Decrease (increase) in restricted cash (170) 50
Deposits and other assets, net 350 (1,246)
Net cash used in investing activities (29,845) (15,129)
Cash Flows From Financing Activities:    
Net proceeds from issuance of common stock 38,018  
Payments on repurchase of common stock (485) (15)
Net proceeds from exercise of common stock options 701 51
Proceeds from borrowing under lines of credit 25,000 51,000
Repayments under lines of credit (40,000) (55,000)
Proceeds from issuance of long-term debt 26,505  
Principal payments on long-term debt (7,149) (1,451)
Net cash provided by (used in) financing activities 40,670 (5,670)
Effect of exchange rate changes on cash (260)  
Net increase in cash and cash equivalents 19,294 1,731
Cash and cash equivalents at beginning of period 53,587 50,213
Cash and cash equivalents at end of period 72,881 51,944
Noncash Investing and Financing Activities:    
Equipment acquired under capital leases 78 712
Supplemental Disclosures of Cash Flow Information:    
Interest paid 978 845
Income taxes paid 86 4,017
Costs Related to Public Offering [Member]
    
Cash Flows From Financing Activities:    
Costs related to public offering (1,920)  
Deferred Offering Cost [Member]
    
Cash Flows From Financing Activities:    
Costs related to public offering   $ (255)