Quarterly report pursuant to Section 13 or 15(d)

Investments (Details)

v3.7.0.1
Investments (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost $ 1,799 $ 1,799
Gross Unrealized Gains 0 0
Gross Unrealized Losses (23) (23)
Fair Value 1,776 1,776
U.S. government security funds    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 1,799 1,799
Gross Unrealized Gains 0 0
Gross Unrealized Losses (23) (23)
Fair Value $ 1,776 $ 1,776