Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 55,107	$ 58,185
Short-term investments	7,567	7,481
Restricted cash	11,533	11,053
Accounts receivable, net of allowance for doubtful accounts	59,623	74,751
Inventories	48,795	52,159
Assets held for sale	0	2,971
Prepaid expenses and other current assets	23,397	26,605
Total current assets	206,022	233,205
Property, plant and equipment, net	89,283	100,090
Operating lease right-of-use assets	16,520
Purchased intangible assets, net	2,532	3,018
Goodwill	1,115	1,115
Other long-term assets	3,144	3,148
Total assets	318,616	340,576
Current liabilities:
Accounts payable	51,857	58,403
Notes payable and short-term borrowing	0	4,795
Current portion of long-term debt	3,048	2,897
Accrued and other current liabilities	43,020	50,288
Total current liabilities	97,925	116,383
Long-term debt, net of current portion	45,181	50,454
Operating lease liabilities, noncurrent	17,577
Other noncurrent liabilities	9,949	13,499
Total liabilities	170,632	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 June 30, 2019, 47,152 shares issued and outstanding; as of December 31, 2018, 46,378 shares issued and outstanding	118	116
Additional paid-in capital	572,734	564,722
Accumulated other comprehensive loss	(5,979)	(7,126)
Accumulated deficit	(418,889)	(397,472)
Total stockholders’ equity	147,984	160,240
Total liabilities and stockholders’ equity	$ 318,616	$ 340,576