Quarterly report pursuant to Section 13 or 15(d)

New Accounting Standards Implemented (Details)

v3.10.0.1
New Accounting Standards Implemented (Details) - USD ($)
Jun. 30, 2018
Mar. 31, 2018
Jan. 02, 2018
Dec. 31, 2017
Liabilities        
Current portion of deferred revenue $ 0   $ 2,612,000 $ 3,214,000
Total current liabilities 5,783,000   2,612,000 5,607,000
Deferred revenue, net of current portion 0   0 3,061,000
Total liabilities 5,783,000   5,005,000 8,668,000
Stockholders' Equity        
Accumulated deficit (376,292,000)   (356,129,000) (359,792,000)
Total stockholders' equity 160,914,000 $ 169,199,000 $ 170,098,000 170,098,000
Scenario Previously Reported        
Liabilities        
Current portion of deferred revenue 602,000     3,214,000
Total current liabilities 6,385,000     3,214,000
Deferred revenue, net of current portion 2,760,000     3,061,000
Total liabilities 9,145,000     8,668,000
Stockholders' Equity        
Accumulated deficit (379,254,000)     (359,792,000)
Total stockholders' equity 164,256,000     170,098,000
Scenario Adjustment        
Liabilities        
Current portion of deferred revenue (602,000)     (602,000)
Total current liabilities (602,000)     (602,000)
Deferred revenue, net of current portion (2,760,000)     (3,061,000)
Total liabilities (3,362,000)     (3,663,000)
Stockholders' Equity        
Accumulated deficit 3,662,000     3,663,000
Total stockholders' equity $ (3,662,000)     $ 0