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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) | 9 Months Ended
--- | ---
Sep. 30, 2013 | Sep. 30, 2012
Cash flows from operating activities: |  |
Net income | $ 12,765,697 | $ 4,602,924
Adjustments to reconcile net income to net cash provided by (used in) operating activities: |  |
Depreciation and amortization | 2,271,181 | 2,592,824
Stock-based compensation expense | 768,534 | 743,947
Deferred tax expense | 2,442,596 |
Gain on bargain purchase |  | (314,244)
Loss on revaluation of contingent consideration | 46,521 | 339,433
Changes in assets and liabilities: |  |
Accounts receivable | (2,118,953) | (4,672,351)
Royalties and other receivables | 2,535,498 | (755,864)
Inventories | 1,149,997 | 3,036,051
Prepaid expenses and other current assets | 264,690 | 247,093
Accounts payable | (1,529,213) | 309,710
Accrued liabilities | (495,056) | 1,087,295
Long-term liabilities | 490,267 | (1,006,654)
Net cash provided by operating activities | 18,591,759 | 6,210,164
Cash flows from investing activities: |  |
Purchases of marketable securities | (23,998,430) | (36,337,643)
Redemptions of marketable securities | 19,893,195 | 36,863,333
Purchases of property, plant and equipment | (3,774,847) | (825,061)
Net cash used in investing activities | (7,880,082) | (299,371)
Cash flows from financing activities: |  |
Exercise of stock options | 2,235,274 | 886,704
Net cash provided by financing activities | 2,235,274 | 886,704
Effect of exchange rate changes on cash and cash equivalents | 87,648 | 424,735
Net increase in cash and cash equivalents | 13,034,599 | 7,222,232
Cash and cash equivalents, beginning of period | 29,209,821 | 11,167,745
Cash and cash equivalents, end of period | $ 42,244,420 | $ 18,389,977

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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
Name: | us-gaap_ShareBasedCompensation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration