Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 135,259	$ 212,273
Restricted cash	687	809
Short-term investments	95,672	48,189
Accounts receivable, net	72,731	66,808
Contract assets	20,782	10,397
Inventories	135,190	156,311
Deferred cost of sales	2,198	3,072
Prepaid expenses and other current assets	23,762	22,221
Total current assets	486,281	520,080
Property, plant, and equipment, net	77,801	80,284
Operating lease right-of-use assets	10,472
Intangible assets, net	72,376	85,149
Goodwill	184,302	184,302
Deferred income taxes	1,872	1,869
Other assets	29,172	29,132
Total assets	862,276	900,816
Current liabilities:
Accounts payable	34,702	39,611
Accrued expenses and other current liabilities	40,641	46,450
Customer deposits and deferred revenue	66,031	72,736
Income taxes payable	663	1,256
Total current liabilities	142,037	160,053
Deferred income taxes	5,713	5,690
Long-term debt	296,810	287,392
Operating lease long-term liabilities	6,066
Other liabilities	9,180	9,906
Total liabilities	459,806	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; 48,903,027 and 48,547,417 shares issued at September 30, 2019 and December 31, 2018, respectively; 48,903,027 and 48,024,685 shares outstanding at September 30, 2019 and December 31, 2018, respectively.	489	485
Additional paid-in capital	1,066,203	1,061,325
Accumulated deficit	(666,058)	(619,983)
Accumulated other comprehensive income	1,836	1,820
Treasury stock, at cost, 522,732 shares at December 31, 2018.		(5,872)
Total stockholders' equity	402,470	437,775
Total liabilities and stockholders' equity	$ 862,276	$ 900,816