Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 162,325	$ 129,294
Restricted cash	652	657
Short-term investments	79,429	115,252
Accounts receivable, net	84,251	45,666
Contract assets	14,612	25,351
Inventories	129,611	133,067
Deferred cost of sales	1,981	445
Prepaid expenses and other current assets	16,446	14,966
Assets held for sale	11,183	11,180
Total current assets	500,490	475,878
Property, plant, and equipment, net	72,291	75,711
Operating lease right-of-use assets	13,159	14,453
Intangible assets, net	57,680	61,518
Goodwill	181,943	181,943
Deferred income taxes	1,549	1,549
Other assets	5,774	7,036
Total assets	832,886	818,088
Current liabilities:
Accounts payable	36,359	21,281
Accrued expenses and other current liabilities	41,568	41,243
Customer deposits and deferred revenue	49,628	54,870
Income taxes payable	954	830
Total current liabilities	128,509	118,224
Deferred income taxes	5,763	5,648
Long-term debt	303,388	300,068
Operating lease long-term liabilities	9,294	10,300
Other liabilities	8,868	9,336
Total liabilities	455,822	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; 49,428,391 shares issued and outstanding at March 31, 2020 and 48,994,346 shares issued and outstanding at December 31, 2019	494	490
Additional paid-in capital	1,074,020	1,071,058
Accumulated deficit	(699,497)	(698,930)
Accumulated other comprehensive income	2,047	1,894
Total stockholders' equity	377,064	374,512
Total liabilities and stockholders' equity	$ 832,886	$ 818,088