Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 90,905	$ 70,467
Short-term investments	7,662	7,638
Restricted cash	10,932	10,972
Accounts receivable, net of allowance for doubtful accounts	61,663	68,890
Inventories	46,146	46,930
Prepaid expenses and other current assets	26,178	25,851
Total current assets	243,486	230,748
Property, plant and equipment, net	76,293	81,133
Operating lease right-of-use assets	15,128	15,603
Purchased intangible assets, net	1,953	2,151
Goodwill	1,115	1,115
Other long-term assets	3,781	3,929
Total assets	341,756	334,679
Current liabilities:
Accounts payable	58,283	58,554
Current portion of long-term debt	3,066	3,044
Accrued and other current liabilities	48,710	47,481
Total current liabilities	110,059	109,079
Long-term Debt, Excluding Current Maturities	37,791	39,237
Operating lease liabilities, noncurrent	15,998	16,543
Other noncurrent liabilities	10,670	9,614
Total liabilities	174,518	174,473
Commitments and contingencies (Note 11)
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, 2020, 48,017 shares issued and outstanding; as of December 31, 2019, 48,256 shares issued and outstanding	122	121
Additional paid-in capital	585,198	582,504
Accumulated other comprehensive loss	(9,841)	(7,871)
Accumulated deficit	(408,241)	(414,548)
Total stockholders’ equity	167,238	160,206
Total liabilities and stockholders’ equity	$ 341,756	$ 334,679