Significant Customers and Contingencies - Additional Information - BASF Supply Agreement (Detail) (USD $)		12 Months Ended		12 Months Ended
	Dec. 31, 2012 Maximum [Member]	Dec. 31, 2013 BASF [Member]	Dec. 31, 2013 BASF [Member] Maximum [Member]	Dec. 31, 2013 BASF [Member] Minimum [Member]
Unusual Risk or Uncertainty [Line Items]
Supply agreements with BASF Corporation		The financial condition covenants in one of our supply agreements with BASF “trigger” a technology transfer right (license and equipment sale at BASF’s option) in the event (a) that earnings for the twelve month period ending with our most recently published quarterly financial statements are less than zero and our cash, cash equivalents and certain investments are less than $1 million (reduced from $2 million during 2012 by mutual agreement), or (b) of an acceleration of any debt maturity having a principal amount of more than $10 million
Cash, cash equivalents and investments, maximum			$ 1,000,000
Minimum contractual covenant - net earnings previous twelve months		0
Principal amount of debt on maturity, minimum				10,000,000
Net book value equipment		115.00%
Original book value of equipment, Minimum				30.00%
Cash cash equivalents and short term investments as per previous agreement	$ 2,000,000
Replacement of equipment period, minimum				12 months