Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Assets
Cash and cash equivalents	$ 86,744	$ 63,008
Short-term investments	180,849	188,893
Accounts receivable, net of allowance for doubtful accounts of $498 and $498 at December 31, 2012 and 2011, respectively	54,549	28,108
Inventories	50,475	65,398
Prepaid expenses and other current assets	7,658	3,862
Total current assets	380,275	349,269
Property, Plant, and Equipment,net	13,869	17,280
Intangible Assets, Net (Excluding Goodwill)	10,630	12,288
Other assets	10,798	10,359
Total assets	415,572	389,196
Liabilities and Stockholders' Equity
Notes payable	1,500	5,120
Accounts payable	14,038	12,080
Accrued expenses	18,028	12,146
Deferred product and services income	4,352	4,499
Total current liabilities	37,918	33,845
Other liabilities	12,456	13,474
Commitments and contingencies
Stockholders' Equity:
Preferred Stock, $0.001 par value: 2,000,000 shares authorized; none issued	0	0
Common stock, $0.001 par value: 80,000,000 shares authorized; 31,033,139 and 30,606,577 shares issued at December 31, 2016 and 2015, respectively; and 26,950,338 and 26,522,276 outstanding at December 31, 2016 and 2015, respectively	31	30
Additional paid-in capital	378,110	366,629
Treasury stock: 4,082,801and 4,084,301 shares at December 31, 2016 and 2015, respectively	(67,163)	(67,185)
Accumulated other comprehensive income (loss)	(619)	(1,199)
Retained Earnings (Accumulated deficit)	54,839	43,602
Total stockholders' equity	365,198	341,877
Total liabilities and stockholders' equity	$ 415,572	$ 389,196