Income Taxes - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Income Taxes [Line Items]
Uncertain tax position accrued	$ 0	$ 0
Uncertain tax positions interest and penalties accrued	0	0
Increase in the valuation allowance	5,900,000
Deferred tax asset for net operating loss carryforwards		$ 8,900,000
Federal [Member]
Income Taxes [Line Items]
Net operating loss carryforward	12,900,000
State [Member]
Income Taxes [Line Items]
Net operating loss carryforward	9,800,000
Australia [Member]
Income Taxes [Line Items]
Net operating loss carryforward	300,000
Germany [Member] | Corporate Income Tax [Member]
Income Taxes [Line Items]
Net operating loss carryforward	66,300,000
Germany [Member] | Trade Tax [Member]
Income Taxes [Line Items]
Net operating loss carryforward	$ 64,900,000