Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Allowance for doubtful accounts	$ 185	$ 399
Common stock, par value (per share)	$ 0.001	$ 0.001
Common stock, shares authorized	100,000,000us-gaap_CommonStockSharesAuthorized
Common stock, shares issued	67,321,769us-gaap_CommonStockSharesIssued	63,866,392us-gaap_CommonStockSharesIssued
Common stock, shares outstanding	67,159,511us-gaap_CommonStockSharesOutstanding	63,866,392us-gaap_CommonStockSharesOutstanding
Treasury stock, shares	162,258us-gaap_TreasuryStockShares	0us-gaap_TreasuryStockShares
Convertible Preferred Stock
Convertible preferred stock, par value (per share)	$ 0.001	$ 0.001
Convertible preferred stock, shares authorized	5,000,000	5,000,000
Convertible preferred stock, shares issued	0	0
Convertible preferred stock, shares outstanding	0	0

A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible.

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