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CONSOLIDATED BALANCE SHEETS - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Current assets:    
Cash and cash equivalents $ 29,821 $ 24,508
Short-term investments 110,667 94,506
Accounts receivable, net 18,673 16,656
Inventory, net 13,282 11,222
Prepaid expenses and other current assets 4,124 2,568
Total current assets 176,567 149,460
Restricted cash 8,775  
Property and equipment, net 19,153 11,794
Intangible asset, net   3,147
Deferred tax asset and receivable, net 213 235
Deposits and other assets 2,262 1,200
Total assets 206,970 165,836
Current liabilities:    
Accounts payable 6,286 6,244
Accrued liabilities 23,964 20,449
Deferred rent 115 95
Total current liabilities 30,365 26,788
Other liabilities 2,745 846
Total liabilities 33,110 27,634
Commitments and contingencies (Note 10)
Stockholders' equity:    
Preferred stock, $0.001 par value; 5,000 shares authorized; no shares issued and outstanding as of December 31, 2018 and December 31, 2017
Common stock, $0.001 par value; 150,000 shares authorized; 36,135 and 34,647 shares issued and 36,107 and 34,619 shares outstanding at December 31, 2018 and December 31, 2017, respectively 36 35
Additional paid-in capital 378,352 331,073
Accumulated other comprehensive income (loss) 738 (591)
Accumulated deficit (205,134) (192,183)
Less treasury stock (28 shares as of December 31, 2018 and December 31, 2017) (132) (132)
Total stockholders' equity 173,860 138,202
Total liabilities and stockholders' equity $ 206,970 $ 165,836