Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 147,588	$ 129,294
Restricted cash	664	657
Short-term investments	161,585	115,252
Accounts receivable, net	80,212	45,666
Contract assets	21,342	25,351
Inventories	143,469	133,067
Deferred cost of sales	1,677	445
Prepaid expenses and other current assets	15,948	14,966
Assets held for sale		11,180
Total current assets	572,485	475,878
Property, plant, and equipment, net	65,811	75,711
Operating lease right-of-use assets	10,522	14,453
Intangible assets, net	50,016	61,518
Goodwill	181,943	181,943
Deferred income taxes	1,555	1,549
Other assets	7,293	7,036
Total assets	889,625	818,088
Current liabilities:
Accounts payable	33,837	21,281
Accrued expenses and other current liabilities	40,667	41,243
Customer deposits and deferred revenue	71,539	54,870
Income taxes payable	891	830
Total current liabilities	146,934	118,224
Deferred income taxes	5,984	5,648
Long-term debt	320,818	300,068
Operating lease long-term liabilities	6,793	10,300
Other liabilities	11,003	9,336
Total liabilities	491,532	443,576
Stockholders' equity:
Preferred stock, $0.01 par value; 500,000 shares authorized; no shares issued and outstanding.
Common stock, $0.01 par value; 120,000,000 shares authorized; 49,612,167 shares issued and outstanding at September 30, 2020 and 48,994,346 shares issued and outstanding at December 31, 2019	496	490
Additional paid-in capital	1,102,959	1,071,058
Accumulated deficit	(707,219)	(698,930)
Accumulated other comprehensive income	1,857	1,894
Total stockholders' equity	398,093	374,512
Total liabilities and stockholders' equity	$ 889,625	$ 818,088