Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 161,715	$ 212,273
Restricted cash	733	809
Short-term investments	84,495	48,189
Accounts receivable, net	58,949	66,808
Contract assets	12,029	10,397
Inventories	139,708	156,311
Deferred cost of sales	7,444	3,072
Prepaid expenses and other current assets	26,444	22,221
Total current assets	491,517	520,080
Property, plant, and equipment, net	80,761	80,284
Operating lease right-of-use assets	11,543
Intangible assets, net	76,689	85,149
Goodwill	184,302	184,302
Deferred income taxes	1,869	1,869
Other assets	29,182	29,132
Total assets	875,863	900,816
Current liabilities:
Accounts payable	21,703	39,611
Accrued expenses and other current liabilities	42,797	46,450
Customer deposits and deferred revenue	84,031	72,736
Income taxes payable	669	1,256
Total current liabilities	149,200	160,053
Deferred income taxes	5,700	5,690
Long-term debt	293,611	287,392
Operating lease long-term liabilities	7,166
Other liabilities	9,160	9,906
Total liabilities	464,837	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; 48,971,017 and 48,547,417 shares issued at June 30, 2019 and December 31, 2018, respectively; 48,971,017 and 48,024,685 shares outstanding at June 30, 2019 and December 31, 2018, respectively.	490	485
Additional paid-in capital	1,062,949	1,061,325
Accumulated deficit	(654,291)	(619,983)
Accumulated other comprehensive income	1,878	1,820
Treasury stock, at cost, 522,732 shares at December 31, 2018.		(5,872)
Total stockholders' equity	411,026	437,775
Total liabilities and stockholders' equity	$ 875,863	$ 900,816