Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 213,506	$ 279,736
Restricted cash	828	847
Short-term investments	52,063	47,780
Accounts receivable, net	90,816	98,866
Contract assets	7,441	160
Inventories	149,832	120,266
Deferred cost of sales	2,986	15,994
Prepaid expenses and other current assets	23,400	33,437
Total current assets	540,872	597,086
Property, plant, and equipment, net	80,626	85,058
Intangible assets, net	89,398	369,843
Goodwill	307,131	307,131
Deferred income taxes	2,183	3,047
Other assets	30,356	25,310
Total assets	1,050,566	1,387,475
Current liabilities:
Accounts payable	65,042	50,318
Accrued expenses and other current liabilities	40,430	58,068
Customer deposits and deferred revenue	64,443	112,032
Income taxes payable	1,819	3,846
Total current liabilities	171,734	224,264
Deferred income taxes	7,170	36,845
Long-term debt	284,369	275,630
Other liabilities	9,206	10,643
Total liabilities	472,479	547,382
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; 48,633,204 and 48,229,251 shares issued at September 30, 2018 and December 31, 2017, respectively; 47,793,001 and 48,144,416 shares outstanding at September 30, 2018 and December 31, 2017, respectively.	486	482
Additional paid-in capital	1,060,733	1,051,953
Accumulated deficit	(475,284)	(212,870)
Accumulated other comprehensive income	1,812	1,812
Treasury stock, at cost, 840,203 and 84,835 shares at September 30, 2018 and December 31, 2017, respectively.	(9,660)	(1,284)
Total stockholders' equity	578,087	840,093
Total liabilities and stockholders' equity	$ 1,050,566	$ 1,387,475