CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Operating activities:
Net income	$ 5,414	$ 2,004
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Provision for obsolete inventory	1,251	768
Depreciation and amortization	4,313	2,670
Loss (gain) on disposal of assets	10	(1)
Share-based compensation and warrant expense	1,049	1,007
Changes in operating assets and liabilities:
Accounts receivable	(1,234)	(2,829)
Notes receivable	980	(463)
Inventory	(19,683)	(12,360)
Other current assets	(1,908)	(1,012)
Accounts payable	(1,118)	9,337
Accrued liabilities	340	1,097
Net cash provided by (used in) operating activities	(10,586)	218
Investing activities:
Purchase of short-term investments	(124)	(53)
Change in restricted cash for construction in progress	(5,089)	0
Purchase of property, plant and equipment	(17,379)	(13,101)
Proceeds from disposal of equipment	45	12
Deposits and deferred charges	(418)	(813)
Purchase of intangible assets	(205)	(3,153)
Net cash used in investing activities	(23,170)	(17,108)
Financing activities:
Proceeds from issuance of long-term debt	8,357	3,150
Principal payments of long-term debt	(870)	(8,076)
Proceeds from line of credit borrowings	72,006	10,763
Repayments of line of credit borrowings	(47,855)	(22,304)
Proceeds from bank acceptance payable	3,405	3,826
Repayments of bank acceptance payable	(2,016)	(3,773)
Repayments of notes payable	(500)	(250)
Increase in restricted cash	(1,975)	(164)
Exercise of stock options	327	219
Proceeds from common stock offering, net	0	45,630
Net cash provided by financing activities	30,879	29,021
Effect of exchange rate changes on cash	(886)	(58)
Net increase (decrease) in cash	(3,763)	12,073
Cash and cash equivalents at beginning of period	32,175	22,006
Cash and cash equivalents at end of period	28,412	34,079
Cash paid for:
Interest	462	254
Income taxes	117	71
Non-cash investing and financing activities:
Purchase of intangible assets with notes payable	$ 0	$ 3,000