Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 59,793	$ 58,185
Short-term investments	7,524	7,481
Restricted cash	11,577	11,053
Accounts receivable, net of allowance for doubtful accounts	65,210	74,751
Inventories	53,618	52,159
Assets held for sale	3,074	2,971
Prepaid expenses and other current assets	23,995	26,605
Total current assets	224,791	233,205
Property, plant and equipment, net	95,688	100,090
Operating lease right-of-use assets	16,847
Purchased intangible assets, net	2,736	3,018
Goodwill	1,115	1,115
Other long-term assets	3,159	3,148
Total assets	344,336	340,576
Current liabilities:
Accounts payable	57,853	58,403
Notes payable and short-term borrowing	2,339	4,795
Current portion of long-term debt	2,963	2,897
Accrued and other current liabilities	50,269	50,288
Total current liabilities	113,424	116,383
Long-term debt, net of current portion	50,213	50,454
Operating lease liabilities, noncurrent	18,019
Other noncurrent liabilities	10,122	13,499
Total liabilities	191,778	180,336
Commitments and contingencies (Note 12)
Stockholders’ equity:
Preferred stock, $0.0025 par value, 10,000 shares authorized, no shares issued or outstanding	0	0
Common stock, $0.0025 par value, 100,000 shares authorized; As of March 31, 2019, 46,455 shares issued and outstanding; as of December 31, 2018, 46,378 shares issued and outstanding	116	116
Additional paid-in capital	568,194	564,722
Accumulated other comprehensive loss	(4,189)	(7,126)
Accumulated deficit	(411,563)	(397,472)
Total stockholders’ equity	152,558	160,240
Total liabilities and stockholders’ equity	$ 344,336	$ 340,576