Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 70,467	$ 58,185
Short-term investments	7,638	7,481
Restricted cash	10,972	11,053
Accounts receivable, net of allowance for doubtful accounts	68,890	74,751
Inventories	46,930	52,159
Assets held for sale	0	2,971
Prepaid expenses and other current assets	25,851	26,605
Total current assets	230,748	233,205
Property, plant and equipment, net	81,133	100,090
Operating lease right-of-use assets	15,603
Purchased intangible assets, net	2,151	3,018
Goodwill	1,115	1,115
Other long-term assets	3,929	3,148
Total assets	334,679	340,576
Current liabilities:
Accounts payable	58,554	58,403
Notes payable and short-term borrowing	0	4,795
Current portion of long-term debt	3,044	2,897
Accrued and other current liabilities	47,481	50,288
Total current liabilities	109,079	116,383
Long-term debt, net of current portion	39,237	50,454
Operating lease liabilities, non-current	16,543
Other noncurrent liabilities	9,614	13,499
Total liabilities	174,473	180,336
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, 100,000 shares authorized, At December 31, 2019, 48,526 shares issued and outstanding; at December 31, 2018, 46,378 shares issued and outstanding	121	116
Additional paid-in capital	582,504	564,722
Accumulated other comprehensive loss	(7,871)	(7,126)
Accumulated deficit	(414,548)	(397,472)
Total stockholders’ equity	160,206	160,240
Total liabilities and stockholders’ equity	$ 334,679	$ 340,576