Quarterly report pursuant to Section 13 or 15(d)

Cash, Cash Equivalents and Investments - Narrative (Details)

v3.7.0.1
Cash, Cash Equivalents and Investments - Narrative (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2017
USD ($)
security
Jun. 30, 2017
USD ($)
security
Cash and Cash Equivalents [Abstract]    
Number of owned securities that were in an unrealized loss position | security 12 12
Other-than-temporary investment losses   $ 0
Unrealized losses deemed to be other-than-temporary, recognized $ 0 $ 0