CONSOLIDATED BALANCE SHEETS - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Current assets:    
Cash and cash equivalents $ 29,530 $ 29,187
Restricted cash 296 311
Short-term investments 37,761 53,523
Accounts receivable, net 21,322 20,155
Inventories 19,855 14,212
Prepaid expenses and other current assets 3,842 2,075
Total current assets 112,606 119,463
Property and equipment, net 6,584 5,089
Long-term investments 13,716 14,509
Intangible assets, net 4,547 1,409
Goodwill 2,760 231
Other assets 1,650 1,329
Total assets 141,863 142,030
Current liabilities:    
Accounts payable 17,588 15,016
Accrued liabilities 5,880 4,750
Deferred revenue 1,099 843
Current portion of notes payable 727 915
Total current liabilities 25,294 21,524
Notes payable 186 913
Other long-term liabilities 938 1,291
Total liabilities $ 26,418 $ 23,728
Commitments and contingencies (Note 11)
Stockholders' equity:    
Common stock, $0.0001 par value; 500,000,000 shares authorized; 24,305,381 and 24,590,768 shares issued; 24,305,381 and 23,436,288 shares outstanding at December 31, 2014 and 2015, respectively $ 2 $ 2
Treasury stock, at cost; 0 and 1,154,480 shares at December 31, 2014 and 2015, respectively (9,020)  
Additional paid-in capital 220,782 212,388
Accumulated deficit (95,580) (93,928)
Accumulated other comprehensive loss (739) (160)
Total stockholders' equity 115,445 118,302
Total liabilities and stockholders' equity $ 141,863 $ 142,030