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Summary of Significant Accounting Policies - Narrative (Details)		3 Months Ended								12 Months Ended
	Jan. 01, 2017 USD ($)	Dec. 31, 2017 USD ($)	Sep. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Sep. 30, 2016 USD ($)	Jun. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2017 USD ($) segment	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Accounting Policies [Abstract]
Net loss from operations		$ (21,506,179)	$ (34,134,570)	$ (9,479,116)	$ (23,085,907)	$ (26,233,470)	$ (20,759,338)	$ (18,704,711)	$ (8,042,820)	$ (88,205,772)	$ (73,740,339)	$ (29,187,606)
Working capital		103,000,000								103,000,000
Accumulated deficit		$ (523,356,317)				$ (434,838,235)				$ (523,356,317)	$ (434,838,235)
Non-controlling interest		15.00%				15.00%				15.00%	15.00%
Number of operating segments | segment										1
Allowance for doubtful accounts		$ 0				$ 0				$ 0	$ 0
Property, Plant and Equipment [Line Items]
Intangible assets, net		6,009,729				7,628,394				6,009,729	7,628,394
Deferred tax assets, valuation allowance		$ 94,039,000				113,407,000				$ 94,039,000	113,407,000
Cumulative effect of accounting change						0					0
Excess tax benefits on stock compensation					$ 1,100,000
Minimum
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, useful life										3 years
Intangible asset, useful life										2 years
Maximum
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, useful life										5 years
Intangible asset, useful life										18 years
Patents | Minimum
Property, Plant and Equipment [Line Items]
Intangible asset, useful life										8 years
Patents | Maximum
Property, Plant and Equipment [Line Items]
Intangible asset, useful life										17 years
Accounting Standards Update 2016-09
Property, Plant and Equipment [Line Items]
Deferred tax assets, valuation allowance						1,100,000					1,100,000
Excess tax benefits on stock compensation	$ 1,100,000
Retained earnings
Property, Plant and Equipment [Line Items]
Cumulative effect of accounting change						(312,310)					(312,310)
Retained earnings | Accounting Standards Update 2016-09
Property, Plant and Equipment [Line Items]
Cumulative effect of accounting change						312,000					312,000
Additional paid-in capital
Property, Plant and Equipment [Line Items]
Cumulative effect of accounting change						312,310					312,310
Additional paid-in capital | Accounting Standards Update 2016-09
Property, Plant and Equipment [Line Items]
Cumulative effect of accounting change						$ (312,000)					$ (312,000)
Options to purchase common stock | Employees and Directors
Property, Plant and Equipment [Line Items]
Dividend yield										0.00%	0.00%	0.00%

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