Stock-Based Compensation (Details) - $ / shares	9 Months Ended	12 Months Ended
	Sep. 30, 2015	Dec. 31, 2014
Number of shares
Balance at beginning of year (in shares)	627,000
Forfeited (in shares)	(99,000)
Balance at end of year (in shares)	528,000	627,000
Exercisable (in shares)	480,333
Weighted-Average Exercise Price
Balance at beginning of year (in dollars per share)	$ 0.0003
Forfeited (in dollars per share)	0.0003
Balance at end of year (in dollars per share)	0.0003	$ 0.0003
Exercisable at end of year (in dollars per share)	$ 0.0004
Weighted- Average Remaining Contractual Term (in Years)
Weighted-Average Remaining Contractual Term (in years)	5 years 10 months 10 days	6 years 5 months 9 days
Exercisable	5 years 8 months 5 days
Number of unvested options scheduled to vest
Unvested options (in shares)	47,667
2015
Number of unvested options scheduled to vest
Unvested options (in shares)	7,334
2016
Number of unvested options scheduled to vest
Unvested options (in shares)	40,333
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized	2,090,000
Number of shares available for grant	1,562,000
Stock option expiration period	10 years
Number of shares
Granted (in shares)	0