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Summary of Significant Accounting Policies (Details) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2018 USD ($) Segment	Mar. 31, 2017 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Restricted Cash [Abstract]
Cash and cash equivalents	$ 171,136		$ 18,142
Restricted cash	208		207
Total	171,344	$ 27,360	$ 18,349	$ 9,665
Short-term Investments [Abstract]
Realized gains (losses) on short-term investment	0	0
Net unrealized gains on short-term investment	10	0
Schedule of Available-for-sale Securities [Line Items]
Cost basis	11,551
Unrealized gains	10
Fair value	11,561
Other than temporary impairment	0
NYC Biotechnology Tax Credit Program [Abstract]
Research and development incentive	$ 186
Research and development incentive receivable		$ 192
Income Taxes [Abstract]
Federal corporate tax rate	21.00%		34.00%
Segment Reporting [Abstract]
Number of operating segments | Segment	1
Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives	5 years
Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives	3 years
Certificates of Deposit [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost basis	$ 1,546
Unrealized gains	0
Fair value	1,546
United States Treasury Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost basis	10,005
Unrealized gains	10
Fair value	$ 10,015

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