Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 129,294	$ 212,273
Restricted cash	657	809
Short-term investments	115,252	48,189
Accounts receivable, net	45,666	66,808
Contract assets	25,351	10,397
Inventories	133,067	156,311
Deferred cost of sales	445	3,072
Prepaid expenses and other current assets	14,966	22,221
Assets held for sale	11,180
Total current assets	475,878	520,080
Property, plant, and equipment, net	75,711	80,284
Operating lease right-of-use assets	14,453
Intangible assets, net	61,518	85,149
Goodwill	181,943	184,302
Deferred income taxes	1,549	1,869
Other assets	7,036	29,132
Total assets	818,088	900,816
Current liabilities:
Accounts payable	21,281	39,611
Accrued expenses and other current liabilities	41,243	46,450
Customer deposits and deferred revenue	54,870	72,736
Income taxes payable	830	1,256
Total current liabilities	118,224	160,053
Deferred income taxes	5,648	5,690
Long-term debt	300,068	287,392
Operating lease long-term liabilities	10,300
Other liabilities	9,336	9,906
Total liabilities	443,576	463,041
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; 48,994,346 and 48,547,417 shares issued at December 31, 2019 and December 31, 2018, respectively; 48,994,346 and 48,024,685 shares outstanding at December 31, 2019 and December 31, 2018, respectively	490	485
Additional paid-in capital	1,071,058	1,061,325
Accumulated deficit	(698,930)	(619,983)
Accumulated other comprehensive income	1,894	1,820
Treasury stock, at cost, 522,732 shares at December 31, 2018.		(5,872)
Total stockholders' equity	374,512	437,775
Total liabilities and stockholders' equity	$ 818,088	$ 900,816