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Condensed Consolidated Balance Sheets - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Dec. 31, 2016
Current assets      
Cash and cash equivalents $ 1,283 $ 3,999 $ 4,409
Restricted cash 1,062 1,325 27,287
Accounts receivables, net 397 317 403
Inventories 1,250 1,248 660
Prepaid expenses and other current assets 382 700 698
Deferred financing costs   0 699
Total current assets 4,374 7,589 34,156
Property, plant and equipment, net 1,099 1,298 1,083
Total assets 5,473 8,887 35,239
Current liabilities      
Accounts payable 5,607 3,846 594
Accrued expenses 5,220 3,408 3,407
Current portion of convertible notes payable, net of discount 387 0 13,343
Warrant liability 6,883 560 18,751
Total current liabilities 18,097 7,814 36,095
Convertible notes payable, net of current portion and debt discount 27 0  
Deferred revenue   0 30
Other non-current liabilities 439 395 604
Total liabilities 18,563 8,209 36,729
Commitments and Contingencies
Stockholders' equity (deficit)      
Preferred stock 0 0 0
Common stock 9 [1] 3 [1] 0 [2]
Additional paid-in capital 311,293 325,516 277,790
Accumulated deficit (324,305) (324,832) (279,188)
Treasury stock (51) [1] (51) [1],[2] (51) [2]
Accumulated other comprehensive income (36) 42 (41)
Total stockholders' (deficit) equity (13,090) 678 (1,490)
Total liabilities and stockholders' equity $ 5,473 8,887 $ 35,239
Previously Reported [Member]      
Stockholders' equity (deficit)      
Common stock [2]   2  
Additional paid-in capital   $ 325,517  
[1] reflects a one-for-three hundred and fifty (1:350) reverse stock split effected on November 6, 2017 and a one-for-five hundred (1:500) reverse stock split effected on May 2, 2018.
[2] reflects a one-for-sixteen (1:16) reverse stock split effected on July 21, 2016, a one-for-three hundred and fifty (1:350) reverse stock split effected on November 6, 2017 and a one-for-five hundred (1:500) reverse stock split effected on May 2, 2018.