Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2017

Summary of Significant Accounting Policies

Schedule of change in the research and development incentive receivable

Balance at January 1, 2016	$	—
Australian research and development incentive income		3,129
Foreign currency translation		(76	)
Balance at December 31, 2016		3,053
Australian research and development incentive income		1,715	(1)
Refund for 2016 eligible expenses		(3,245	)
Foreign currency translation		221
Balance at December 31, 2017	$	1,744

(1) Certain supporting research and development activity is performed outside of Australia when there are no Australian facilities that support the activity ("Overseas research and development activities"). In October 2017, the Commonwealth of Australia issued the Company a favorable ruling on its Overseas research and development activities, considering such activities to be eligible research and development activities under the Australian Incentive Program. As such, the Company recorded Australian research and development incentives during the year ended December 31, 2017 for its Overseas research and development activities performed during the year ended December 31, 2016 of $717.

Summary of assets and liabilities carried at fair value in accordance with the hierarchy

        A summary of the assets and liabilities carried at fair value in accordance with the hierarchy defined above is as follows (in thousands):

	Total		Level 1		Level 2		Level 3
December 31, 2017
Assets:
Cash equivalents	$	25,737	$	25,737	$	—	$	—
Total assets	$	25,737	$	25,737	$	—	$	—
Liabilities:
Warrant liability	$	11,862	$	—	$	—	$	11,862
Total liabilities	$	11,862	$	—	$	—	$	11,862
December 31, 2016
Assets:
Cash equivalents	$	793	$	793	$	—	$	—
Total assets	$	793	$	793	$	—	$	—

Schedule of the recurring fair value measurements of the warrant derivative liability categorized with Level 3 inputs

        A roll-forward of the recurring fair value measurements of the warrant liability categorized with Level 3 inputs are as follows (in thousands):

	Warrant Liability
Balance—December 31, 2016	$	—
Initial fair value		12,335
Change in fair value		(473	)
Balance—December 31, 2017	$	11,862