Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2018

Schedule of Estimated Useful Life of Assets

Depreciation is calculated on a straight-line basis over the following estimated useful lives of the assets:

Equipment, Furniture and Software	3-7 years
Leasehold Improvements	Shorter of asset life or lease term

ASC 606 [Member]

Summary of Result of Adopting ASC 606 on Financial Statement

Impact of Adoption

As a result of adopting ASC 606 on January 1, 2018, the Company has revised its comparative financial statements for the prior year as if ASC 606 had been effective for that period. As a result, the following financial statement line items were affected as of December 31, 2017 and for the years ended December 31, 2017 and 2016.

Consolidated Balance Sheets
	As of December 31, 2017
	As revised under ASC 606			As originally reported under ASC 605			Effect of change
	(in thousands)
Current portion of deferred revenue	$	1,275		$	2,705		$	(1,430	)
Deferred revenue, net of current portion		7,241			5,607			1,634
Accumulated deficit		(192,716	)		(192,512	)		(204	)

Consolidated Statements of Operations and Comprehensive Loss

	For the Year Ended December 31, 2017
	As revised under ASC 606			As originally reported under ASC 605			Effect of change
	(in thousands, except per share data)
Revenue	$	3,893		$	3,704		$	189
Loss from operations		(102,391	)		(102,580	)		189
Income tax benefit (provision)		(842	)		(708	)		(134	)
Net loss		(101,980	)		(102,035	)		55

	For the Year Ended December 31, 2016
	As revised under ASC 606			As originally reported under ASC 605			Effect of change
	(in thousands, except per share data)
Revenue	$	1,092		$	1,485		$	(393	)
Loss from operations		(55,720	)		(55,327	)		(393	)
Income tax benefit (provision)		(482	)		(616	)		134
Net loss		(55,660	)		(55,401	)		(259	)
Net loss per share attributable to ordinary shareholders—basic and diluted	$	(2.44	)	$	(2.43	)	$	(0.01	)

Consolidated Statement of Cash Flows
	For the Year Ended December 31, 2017
	As revised under ASC 606			As originally reported under ASC 605			Effect of change
	(in thousands)
Net loss	$	(101,980	)	$	(102,035	)	$	55
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Deferred income taxes		908			774			134
Changes in operating assets and liabilities:
Deferred revenue		(2,893	)		(2,704	)		(189	)

	For the Year Ended December 31, 2016
	As revised under ASC 606			As originally reported under ASC 605			Effect of change
	(in thousands)
Net loss	$	(55,660	)	$	(55,401	)	$	(259	)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Deferred income taxes		(698	)		(564	)		(134	)
Changes in operating assets and liabilities:
Deferred revenue		11,408			11,015			393