CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Current Assets
Cash and cash equivalents	$ 28,074	$ 32,175
Restricted cash	4,719	509
Short-term investments	7,886	8,189
Accounts receivable - trade, net of allowance of $51 and $43, respectively	38,775	31,589
Inventories	66,238	33,780
Notes receivable	0	980
Prepaid expenses and other current assets	8,236	6,017
Total current assets	153,928	113,239
Property, plant and equipment, net of accumulated depreciation of $37,980 and $32,412, respectively	109,699	64,808
Land use rights, net	854	930
Intangible assets, net	3,900	3,833
Other assets, net	5,094	860
TOTAL ASSETS	273,475	183,670
Current liabilities
Current portion of notes payable and long-term debt	30,908	9,591
Accounts payable	28,668	30,984
Bank acceptance payable	2,998	1,271
Accrued liabilities	11,506	6,755
Total current liabilities	74,080	48,601
Notes payable and long-term debt, less current portion	33,997	19,057
Other long-term liabilities	0	1,000
TOTAL LIABILITIES	108,077	68,658
Stockholders' equity (deficit):
Preferred Stock; 5,000 shares authorized at $0.001 par value; no shares issued and outstanding at December 31, 2015 or 2014, respectively	0	0
Common Stock; 45,000 shares authorized at $0.001 par value; 16,839 and 14,824 shares issued and outstanding at December 31, 2015 and 2014, respectively	17	15
Additional paid-in capital	233,336	192,112
Accumulated other comprehensive gain	292	1,925
Accumulated deficit	(68,247)	(79,040)
TOTAL STOCKHOLDERS' EQUITY	165,398	115,012
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	$ 273,475	$ 183,670