Stock Option Award Activity (Detail)	12 Months Ended
	Dec. 31, 2016 $ / shares shares
Number of options
Options outstanding at beginning of year | shares	24,089
Granted | shares	1,250
Canceled or forfeited | shares	(8,424)
Options outstanding at end of year | shares	16,915
Options exercisable | shares	9,095
Options vested and expected to vest | shares	16,915
Weighted Average Exercise Price
Options outstanding at beginning of year | $ / shares	$ 535.80
Granted | $ / shares	5.66
Canceled or forfeited | $ / shares	951.23
Options outstanding at end of year | $ / shares	289.73
Options exercisable | $ / shares	504.80
Options vested and expected to vest | $ / shares	$ 289.73
WEIGHTED AVERAGE REMAINING CONTRACTUAL TERM
Options outstanding	7 years 6 months 15 days
Options exercisable	6 years 7 months 10 days
Options vested and expected to vest	7 years 6 months 15 days