CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 76,578	$ 95,117
Short-term investments	27,674	27,669
Restricted cash	495	489
Accounts receivable, net	57,901	45,232
Inventories	48,663	46,901
Prepaid expenses and other current assets	18,673	20,173
Total current assets	229,984	235,581
Property, plant and equipment, net	57,134	66,765
Operating lease right-of-use assets	13,922	13,823
Purchased intangible assets, net	985	1,468
Goodwill	1,115	1,115
Other long-term assets	5,159	4,912
Total assets	308,299	323,664
Current liabilities:
Accounts payable	59,303	43,539
Short-term borrowing, net	14,822	0
Current portion of long-term debt	3,015	3,232
Accrued and other current liabilities	24,983	42,053
Total current liabilities	102,123	88,824
Long-term debt, net of current portion	26,570	30,327
Operating lease liabilities, noncurrent	14,150	14,522
Other noncurrent liabilities	8,315	9,584
Total liabilities	151,158	143,257
Commitments and contingencies (Note 10)
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 September 30, 2021, 52,659 shares issued and outstanding; at December 31, 2020, 50,457 shares issued and outstanding	132	126
Additional paid-in capital	604,727	597,460
Accumulated other comprehensive income	1,180	1,735
Accumulated deficit	(448,898)	(418,914)
Total stockholders’ equity	157,141	180,407
Total liabilities and stockholders’ equity	$ 308,299	$ 323,664