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Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Current assets:    
Cash and cash equivalents $ 46,575 $ 144,583
Short-term investments 67,363 27,796
Accounts receivable, net 37,713 41,874
Inventory 19,418 10,108
Prepaid expenses and other current assets 5,494 3,702
Total current assets 176,563 228,063
Property and equipment, net 6,504 5,981
Other assets 316 263
Total assets 183,383 234,307
Current liabilities:    
Accounts payable 11,458 18,769
Accrued clinical liabilities 24,934 26,920
Accrued payroll and employee liabilities 5,248 8,860
Other accrued liabilities 20,643 17,175
Deferred revenue 2,763
Promissory note payable to related party 25,000 25,000
Convertible notes payable to related parties, net of discount 3,894 3,684
Total current liabilities 91,177 103,171
Stockholders’ equity:    
Common stock 650 646
Additional paid-in capital 925,745 913,955
Accumulated other comprehensive loss (42) (10)
Retained earnings (834,147) (783,455)
Total stockholders’ equity 92,206 131,136
Total liabilities and stockholders’ equity $ 183,383 $ 234,307