CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Current assets:    
Cash and cash equivalents $ 19,989 $ 29,761
Restricted cash 283 273
Short-term investments 49,612 44,057
Accounts receivable, net 26,751 29,925
Inventories 39,314 37,171
Prepaid expenses and other current assets 5,348 4,369
Total current assets 141,297 145,556
Property and equipment, net 7,104 7,337
Long-term investments 6,803 12,038
Intangible assets, net 24,627 26,081
Goodwill 21,828 21,867
Other assets 1,488 1,618
Total assets 203,147 214,497
Current liabilities:    
Accounts payable 21,881 25,654
Accrued liabilities 8,179 10,835
Current portion of deferred revenue 4,778 4,538
Total current liabilities 34,838 41,027
Other long-term liabilities 3,983 3,942
Total liabilities 38,821 44,969
Commitments and contingencies (Note 10)
Stockholders' equity:    
Common stock, $0.0001 par value; 500,000,000 shares authorized; 26,008,294 and 25,832,895 shares issued and outstanding at March 31, 2018 and December 31, 2017, respectively 3 3
Additional paid-in capital 236,229 242,281
Accumulated deficit (71,260) (72,225)
Accumulated other comprehensive loss (646) (531)
Total stockholders' equity 164,326 169,528
Total liabilities and stockholders' equity $ 203,147 $ 214,497