Deferred Revenue - Additional Information (Details)								3 Months Ended
	May 28, 2016 USD ($)	Dec. 23, 2015 USD ($)	Oct. 02, 2015 USD ($)	Sep. 22, 2015 USD ($) shares	Jul. 20, 2015 USD ($) shares	Sep. 17, 2014 USD ($) shares	Dec. 17, 2013 USD ($) shares	Mar. 31, 2018 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2017 USD ($)
Deferred Revenue Arrangement [Line Items]
Proceeds from funding agreement	$ 266,500	$ 715,500	$ 618,000	$ 1,600,000	$ 250,000	$ 500,000	$ 250,000
Interest in asset	0.35533%	0.954%	0.824%	2.1333%	0.50%	1.00%	0.50%
Number of shares issuable term				60 days	60 days	60 days	60 days
Number of shares issuable (in shares) | shares					25,000	62,500	31,250
Recognized as revenue								$ 54,000
Number of shares per dollar exchange rate (in shares) | shares				0.1
Current portion								277,000		$ 379,000
Within 2.5 Years
Deferred Revenue Arrangement [Line Items]
Buyback term on ownership percentage				2 years 6 months
Buyback rate				2
After 2.5 Years
Deferred Revenue Arrangement [Line Items]
Buyback term on ownership percentage				2 years 6 months
Buyback rate				3.5
Research and Development Arrangement December 17, 2013
Deferred Revenue Arrangement [Line Items]
Recognized as revenue								14,400	$ 10,900
Research and Development Arrangement September 17, 2014
Deferred Revenue Arrangement [Line Items]
Recognized as revenue								39,200	$ 0
Research and Development Arrangement July 20, 2015
Deferred Revenue Arrangement [Line Items]
Recognized as revenue								0
Research and Development Arrangement September 22, 2015
Deferred Revenue Arrangement [Line Items]
Recognized as revenue								$ 0