Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 58,185	$ 78,906
Short-term investments	7,481	12,311
Restricted cash	11,053	2,658
Accounts receivable, net of allowance for doubtful accounts	74,751	67,229
Inventories	52,159	67,301
Assets held for sale	2,971	0
Prepaid expenses and other current assets	26,605	36,235
Total current assets	233,205	264,640
Property, plant and equipment, net	100,090	127,565
Purchased intangible assets, net	3,018	4,294
Goodwill	1,115	1,115
Other long-term assets	3,148	5,339
Total assets	340,576	402,953
Current liabilities:
Accounts payable	58,403	69,017
Notes payable and short-term borrowing	4,795	35,607
Current portion of long-term debt	2,897	6,005
Accrued and other current liabilities	50,288	43,242
Total current liabilities	116,383	153,871
Long-term debt, net of current portion	50,454	40,556
Other noncurrent liabilities	13,499	14,075
Total liabilities	180,336	208,502
Commitments and contingencies (Note 14)
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, At December 31, 2018, 46,378 shares issued and outstanding; at December 31, 2017, 44,219 shares issued and outstanding	116	111
Additional paid-in capital	564,722	545,953
Accumulated other comprehensive income (loss)	(7,126)	398
Accumulated deficit	(397,472)	(352,011)
Total stockholders’ equity	160,240	194,451
Total liabilities and stockholders’ equity	$ 340,576	$ 402,953