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Condensed Consolidated Balance Sheets (Unaudited) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Current assets:    
Cash and cash equivalents $ 28,235 $ 20,023
Short-term investments 30,507 58,320
Accounts receivable, net 28,252 21,977
Inventory 2,504 2,062
Prepaid expenses and other current assets 3,810 4,100
Total current assets 93,308 106,482
Property and equipment, net 10,208 9,158
Operating lease right-of-use assets 9,232  
Goodwill 862 862
Other assets 3,574 3,208
Total assets 117,184 119,710
Current liabilities:    
Accounts payable 1,960 2,284
Accrued liabilities 20,099 26,570
Deferred revenue 1,309 1,243
Accrued interest, current portion 129 139
Operating lease liabilities, current portion 5,052  
Total current liabilities 28,549 30,236
Debt 34,922 34,899
Deferred rent, noncurrent portion   153
Operating lease liabilities, noncurrent portion 3,990  
Total liabilities 67,461 65,288
Commitments and contingencies (Note 6)
Stockholders’ equity:    
Preferred stock, $0.001 par value – 5,000,000 shares authorized at March 31, 2019 and December 31, 2018; and none issued and outstanding at March 31, 2019 and December 31, 2018
Common stock, $0.001 par value – 100,000,000 shares authorized at March 31, 2019 and December 31, 2018; 24,628,643 and 24,368,073 shares issued and outstanding at March 31, 2019 and December 31, 2018, respectively 24 23
Additional paid-in capital 261,231 257,955
Accumulated other comprehensive income (loss) 2 (41)
Accumulated deficit (211,534) (203,515)
Total stockholders’ equity 49,723 54,422
Total liabilities and stockholders’ equity $ 117,184 $ 119,710